# Homework Help: Math: Trigonometry

## Recent Homework Questions About Trigonometry

**trig**

Forces of 15 kg and 10 kg act on a point with an angle of 60◦ between the forces. Find the magnitude of the resultant force (to nearest tenth of a kilogram) and the angle (to the nearest degree) the resultant makes with the 15 kg force

*Tuesday, April 28, 2015 by syed*

**Physics**

The equation of a transverse wave traveling in a string is given by y(x,t) = 10 cos (π/2)(0.0050x - 8.0t + 0.57), in which x and y are expressed in centimeters and t in seconds. Write down the equation of a wave which, when added to the given one, would produce standing ...

*Tuesday, April 28, 2015 by Nora*

**Trig**

If tan x = -sq rt3/3 and cos x = -sq rt3/2, the measure of <x is?

*Friday, April 24, 2015 by Patti*

**Trig**

The graph of y-7 cosθ + 24 sinθ would be a sinusoid if it were plotted. What would be the first positive value of θ at which there is a high point?

*Wednesday, April 22, 2015 by Elle*

**Trig**

Please help with this question: A plane travels a distance of 140 km due west of Vancouver International Airport. It then travels 60 km at a bearing of 340 degrees. How far from the Airport is the plane? Thank you for all your help.

*Monday, April 20, 2015 by Cassandra*

**Trig**

Can you please help with this trig question: The angle of elevation to the top of a nearby mountain is 46 degrees. After walking 1 km toward the mountain, you determine the angle of elevation to be 68 degrees. How high is the mountain? Thank you for all your help.

*Monday, April 20, 2015 by Cassandra*

**Trig**

Prove that : (Sin Ө + Cosec Ө)/(Tan Ө+Cot Ө) = Sin Ө + Cos Ө

*Sunday, April 19, 2015 by Someone*

**Precalculus Trig (Geometry)**

A rectangular doorway is 38 meters wide and 60 meters high. The doorway is capped with a semi-ellipse that is 13 meters high at its center. Find the height h of the doorway and window 5 meters from the center. From the ellipse equation, I can see that a should be 19 and b ...

*Sunday, April 19, 2015 by Michele*

**Precalculus Trig (Geometry)**

A large doorway has the shape of a parabolic arch. The doorway is 20 feet high at the top of the arch and 20 feet wide at the base. At a height of 10 feet above the floor, find the width of the arch. If you start the vertex of the parabola at 0,0, that means the equation ...

*Sunday, April 19, 2015 by Michele*

**trig**

Karen earns 43 dollars per week working pt at a bookstore. she makes one dollar more for each book she sells. the amt A, in dollars that Karen earns in a week ifshe sells b books is given in the function A(b) =43 + b how much does she earnin a week if she sells 22 books?

*Saturday, April 18, 2015 by denise*

**geometry/trig**

Initially a fifty foot ladder rests against a wall. As I start to climb it, the ladder slides down, finally stopping such that the ladder touches the wall at a point 8 feet below where it originally touched the wall. During the slide, the base of the ladder slid 16 feet from ...

*Wednesday, April 15, 2015 by eman*

**trig**

solve triangle ABC which have angleA=25.25,angleB=60.51 and a=3.82..find c...,find b

*Saturday, April 11, 2015 by jose*

**trig**

if sin23=p,write down the following in terms of P *cos113 *cos23 *sin46 so i draw the diagram an solve for x in terms of P an got 1-p so i don't know how to apply cos113and sin46 in terms of 23 or P but *cos 23 i wrote it as> 1-p/1 wch is 1-p

*Sunday, April 5, 2015 by onika*

**Calculus**

1. integral (x^3 * sqrt(x^2-4)) dx I'm confused on how to start this problem, if I am doing trig substitution.

*Sunday, April 5, 2015 by K*

**trig**

How do I verify this? Cos^4x-Sin^4x=1-tan^2x/sec^2x

*Thursday, April 2, 2015 by Alli*

**Calculus 2 (Differential Equation)**

How would you solve the following problem explicitly? Sqrt(1-y^2) dx - sqrt(1-x^2) dy I separated the x and y terms and got: Integral of 1/sqrt(1-x^2) dx = Integral of 1/sqrt(1-y^2) dy I was wondering how would you take the anti-derivative of each function. I believe we are ...

*Thursday, March 26, 2015 by Rena*

**Trig**

An isosceles triangle has legs 4 feet long. If the vertex angle measures 30 degrees, find the length of the base.

*Monday, March 23, 2015 by Anonymous*

**trig**

If cos A= -6/7, in quadrant 2, determine the exact value of tan 2A I don't understand how to do this?

*Sunday, March 22, 2015 by Jennifer*

**trig**

y= 3 cos(x+pi)-3

*Thursday, March 19, 2015 by ana grace barba*

**trig**

A gear with a radius of 32 centimeters is turning at pi/9 radians/sec. What is the linear speed (velocity) at a point on the outer edge of the gear?

*Sunday, March 15, 2015 by Chris*

**calculus trig substitution**

∫ x^3 √(x^2+9) dx If you work it can you write the steps? I really don't like the way my teacher teaches it. Someone else doing it might help.

*Saturday, March 14, 2015 by Allie*

**trig**

a balloon is tethered to the ground by a string 5 m long if the string makes an angle of 65 degrees with the ground how high above the ground is the balloon

*Friday, March 13, 2015 by liz*

**trig**

A frisbee is thrown within an angular velocity of 360 rpm. If the diameter of the frisbee is 12 inches, how fast does it travel when it hits the ground rolling on the side? round your answer to the nearest mph

*Thursday, March 12, 2015 by Angela*

**Trig**

How do you derive this identity? Cos(t)=1-sin^2(t/2)

*Wednesday, March 11, 2015 by Jean*

**Trig verifying identities**

I am having trouble with this problem. sec^2(pi/2-x)-1= cot ^2x I got : By cofunction identity sec(90 degrees - x) = csc x secx csc-1 = cot^2x Then split sec x and csc-1 into two fractions and multiplied both numerator and denominators by csc and got: sec x csc^2x-1= cot^2x ...

*Monday, March 9, 2015 by Hutch*

**Trig**

A pendulum swinging through a central angle of Ts completes an arc of length 6.4 cm. What is the length of the pendulum?

*Sunday, March 8, 2015 by Laura*

**Pre-calc/trig**

i think its a or b Which scenario describes periodic behavior? A pendulum swinging back and forth A ball bouncing up and down on the ground The takeoff and landing of a jet plane The path a dolphin swims in the ocean

*Friday, March 6, 2015 by Anonymous*

**Precalc+trig**

Solve tan(40/90) for the double angle cos(2theta). I know I use the x^2 + y^2 = r^2 formula and cos(2theta) = cos^2theta - sin^2theta. But I don't understand my answer

*Wednesday, March 4, 2015 by Anna*

**trig equations**

Find all solutions (if they exist)for the given equation on the interval [0,2pi) cos^2x-5sinx+5=0

*Wednesday, March 4, 2015 by Elan*

**trig.**

If P (x, y) is the point on the unit circle determined by the real number θ, then tan θ= x/y y/x 1/x 1/y

*Friday, February 27, 2015 by Anonymous*

**trig**

what is the reference angle for 11π/6? how would i do this?

*Friday, February 27, 2015 by Anonymous*

**trig with enough info?**

Two oil Wells are 4 km and 6 km from the river. The points along the river are 8 km apart. Find the common loading point on the river, using the shortest amount of pipe.

*Wednesday, February 25, 2015 by Chris*

**trig**

Two oil Wells are 4 km and 6 km from the river. The points along the river are 8 km apart. Find the common loading point on the river.

*Wednesday, February 25, 2015 by Chris*

**trig**

An airplane is traveling at a speed of 724 km per hour at a bearing of N30°E. If the wind velocity is 32 km per hour from the west, find the resultant speed and direction of the plane.

*Monday, February 23, 2015 by Lin*

**Trig application**

I worked this problem out but I do not fully understand what I am doing. Fire tower A is 30 kilometers due west of fire tower B.. A fire is spotted from the towers, and the bearings from A and B are N 76 degrees E and N 56 degrees W, respectively. Find the distance d of the ...

*Saturday, February 21, 2015 by Hutch*

**Trig application**

I am having trouble with this question. A privately owned yacht leaves a dock in Myrtke Beach, South Carolina, and heads toward Freeport in the Bahamas at a bearing of S 1.4 degrees E. The yacht averages a speed of 20 knots over the 428-nautical- mile trip. A. How long will it...

*Saturday, February 21, 2015 by Hutch*

**Trig application**

I have been working on this problem but I am not sure I am doing it right. During takeoff an airplane's angle of ascent is 18 degrees and its speed is 275 feet per second. A. Find the plane's altitude after 1 minute. B. How long will it take for the plane to climb to an ...

*Saturday, February 21, 2015 by Hutch*

**Quadratic equations Trig**

I am having a hard time figuring this out. I know I need to find the vertex from the vertex form equation but I am having a hard time figuring out the equation. A caterer will charge a certain club $20 per member to cater a dinner if 150 members attend. However, the cost per ...

*Wednesday, February 18, 2015 by Hutch*

**algebra/trig**

You need a 100 pounds of two types of candy that cost 50 cents per pound and 75 cents per pound. A.) Verify that your total cost is c(x)=0.50x + 0.75(100-x) thx a ton:)

*Tuesday, February 17, 2015 by favour*

**Trig/Precalc**

The system of equations: |z-2-2i|=sqrt(23), |z-8-5i|=sqrt(38) has two solutions z_1 and z_2 in complex numbers. Find (z_1+z_2)/2. My first instinct on this problem was to square each equation given that the square of the magnitude of a complex number is much easier to deal ...

*Monday, February 16, 2015 by majorbill*

**Calculus**

Integration with trig functions Integral of [(1-sinx)/cos^2x] dx

*Thursday, February 12, 2015 by Anonymous*

**Math/Trig**

From an observation tower that overlooks a runway, the angles of depression of point A, on one side of the runway, and point B, on the opposite side of the runway are 6 degrees and 13 degrees respectively. The points and the tower are in the same vertical plane and the ...

*Thursday, February 12, 2015 by Renee*

**Calculus**

What would an example of a logarithmic function that contains two trig functions within it where you would need to use chain rule and product rule to take derivative look like? How would taking the derivative of the function in its original form look different when using log ...

*Thursday, February 12, 2015 by Robin*

**trig**

I am currently taking a trig class. I need help understanding how to solve for sin,cos, and tan in problems which give an angle and a side length or the hypotenus. Any help would be muchly appreciated

*Wednesday, February 11, 2015 by Ben*

**Trigonometry**

Find cotangent theta given that cosecant theta equals -3.5891420 and theta is in the third quadrant. I was using the trig identity 1+cot^2theta=csc^2theta I wanted to isolate cotangent so I plugged in 1/sin (-3.5891420) and then squared my answer. I then subtracted one from ...

*Monday, February 9, 2015 by Maddy*

**trig**

A man is between two tall buildings 8m away from the taller building. If the angle of the top of the building from where he stans bears N 8degrees W for the taller one and N 12degrees E for other. How far is he from the other building if the taller building is 6/5 as to the other

*Monday, February 9, 2015 by Sam*

**trig**

From post C, An airplane and a helicopter travel to different islands.The plane travels.415 km N 60degrees45minutes E to island A. and the helicopter travels to island B at S 19degrees5minutes E for 120 km. what is the distance between tthe two island

*Monday, February 9, 2015 by Kelly*

**Trig**

Bob the ranger is atop a fire tower that i son the side of a mountain.The fire tower is 10 meters high and the angle of depression from the top of the tower to the base of the mountain is 48 degrees. The tower creates a 115 degree angle with the mountain. How far up he ...

*Thursday, February 5, 2015 by Jordyn*

**Trig**

How do i solve sinx/cosx(sinx+cosx/sinx×cosx)=secx? I know it's 1/cosx because it equals secx but I don't know how to get there? :^(

*Thursday, February 5, 2015 by Jodi*

**trig**

two ships p and q left a port at the same time. q sailed on a bearing of 150 while p sailed on the north side of q. after a distance of 8km and 10km by pand q respectively, their distance apart was 12km. find the bearing of p and r

*Wednesday, February 4, 2015 by isaac*

**Geometry**

I am having trouble with this question. I do not know where to begin. I am in Trig now and we are doing review but I forgot everything that I learned in Geometry. I want to understand how to do this problem. "a picture measures 20 cm by 25 cm. the width of the matting and ...

*Tuesday, January 27, 2015 by Hutch*

**Trig 4**

Can someone break down the meaning of sin, tan, and cos into simpler more understandable terms?

*Sunday, January 25, 2015 by Shanu*

**Trig/ English**

I need an Acrostic poem for the word "Exponent"

*Thursday, January 22, 2015 by Emily*

**Precalc/Trig**

I don't understand how to do these problems: Find two pairs of polar coordinates for each point with the given rectangular coordinates if 0 ≤ θ ≤ 2π. Round to the nearest hundredth, if necessary. 17. (2, -3) Answers: (3.61, 5.30) and (-3.61, 2.16) 19. (a...

*Wednesday, January 21, 2015 by Heather*

**Trig/Precalc**

Two questions that I would really appreciate some hints on: 1) Circles with centers (2,1) and (8,9) have radii 1 and 9, respectively. The equation for a common external tangent can be written in the form y=mx+b with 0<m. What is b? 2) In triangle ABC, AB=BC, and BD is an ...

*Tuesday, January 20, 2015 by majorbill*

**Pre-Calc/Trig**

write an equation of the conic section: a hyperbola with vertices (0,-6) and (0,6) and asymptotes y=(3/4)x and y=(-3/4)x

*Tuesday, January 13, 2015 by Anonymous*

**trig**

an observer at A looks due north and sees a meteor with an angle of elevation of 70 degrees. At the same instant, another observer 30 miles east of A seed the same meteor and approximates its position as N 50 degrees W but fails to note its angle of elevation. Find the height ...

*Sunday, January 11, 2015 by olivia*

**Pre-Calc/Trig**

Complete the following for each system that involves one or more quadratic equations: Solve the system algebraically 7y^2-5x^2+20x=3 5x^2+21y^2=209

*Thursday, January 8, 2015 by Anonymous*

**trig**

a guy wire reaches from the top of a 125 meter television transmitter tower to the ground.The wire makes a 63' angle with the ground.Find the length of the guy wire.

*Monday, January 5, 2015 by gly*

**Pre-calc/trig**

5=log3(x^2+18)

*Sunday, January 4, 2015 by Anonymous*

**Pre-calc/Trig**

For each parabola, find the vertex and focus. x= (1/400)y^2 y= 1/8(x-3)^2-1

*Sunday, January 4, 2015 by Anonymous*

**Trig/Precalc**

So I have two questions that have been puzzling me for quite some time and would really appreciate any help with either of them! (a) There are four positive intergers a, b, c, and d such that 4cos(x)cos(2x)cos(4x)=cos(ax)+cos(bx)+cos(cx)+cos(dx) for all values of x. ...

*Sunday, January 4, 2015 by majorbill*

**Pre-calc/Trig**

For each parabola, tell in which direction the graph opens. x= 1/2y^2 y= -1/24x^2

*Sunday, January 4, 2015 by Anonymous*

**trig**

prove that the equation 2sin x cos x +4cos^2 x =1 may be written in the form of tan^2 x -2tan x -3=0

*Saturday, January 3, 2015 by Nus*

**Pre-Calc/Trig**

A potato is put into an oven that has been heated to 350F. Its temperature as a function of time is given by T(t) = a(1 - e-kt) + b. The potato was 50F when it was first put into the oven. if the potato is 60F after 2 minutes, what is the value of k? ...

*Tuesday, December 30, 2014 by Anonymous*

**Pre-Calc/Trig**

A body was found at 6 a.m. outdoors on a day when the temperature was 50oF. The medical examiner found the temperature of the body to be 66oF. What was the approximate time of death? Use Newton's law of cooling, with k = 0.1947. A. Midnight (12 a.m.) B. 5 a.m. C. 2 a.m. D. 3 a...

*Tuesday, December 30, 2014 by Anonymous*

**Pre-Trig/Calc**

Please help :) A potato is put into an oven that has been heated to 350F. Its temperature as a function of time is given by T(t) = a(1 - e-kt) + b. The potato was 50F when it was first put into the oven. What is the value of b in this context? Explain. What is ...

*Monday, December 29, 2014 by Anonymous*

**Trig/Precalc**

Find the greatest possible value of 5cos(x)+6sin(x). I know that it would be a good idea to look for identities that are in the form of acos(x)+bsin(x), but I can't seem to find any. Other than that I don't really know where to go with this problem. Any help would be much ...

*Tuesday, December 16, 2014 by majorbill*

**trig**

1. The sides of a triangle, in centimetres, are given by 3n-4, 3n+9, 4n+5. Draw a diagram to show the information. If the perimeter of the triangle is 114 cm, find the length of each side.

*Thursday, December 11, 2014 by majid*

**Trig**

What is the period of f(x)=sin4x. I got pi/2 but on my answer list, it is not on there. a.4pi b.2pi c.pi d.1/2pi Which one would i choose?

*Thursday, December 11, 2014 by Anonymous*

**Pre-Calc/Trig...**

what is In e^4.3 equivalent to? How?

*Wednesday, December 10, 2014 by Anonymous*

**Pre-Calc/Trig...**

Which of the following could be an example of a function with a domain (-oo,oo) and a range (-oo,2)? Check all that apply. A. y= -(3)^x+2 B. y= -(3)^x-2 C. y= -(0.25)^x+2 D/ y= -(0.25)^x-2

*Tuesday, December 9, 2014 by Anonymous*

**Trig**

Verify each trigonimetric equation by substituting identities to match right hand side of the equation to the hand side of the equation. Please help. -tan^2x+sec^2x=1

*Monday, December 8, 2014 by Nancy Jones*

**trig**

Solve R=3(1-sin theta) and graph

*Monday, December 8, 2014 by Anonymous*

**Math (TRIG)**

Please help me set up these problems. 1.) Find an equivalent equation in rectangular coordinates. r(1 - 2 cos θ) = 1 2.) Find a rectangular equation for the plane curve defined by the parametric equations. x = sec t, y = tan 3.) A projectile is fired with an initial ...

*Monday, December 8, 2014 by Amber*

**Trig (math)**

1.) Find all solutions of the equation. Leave answers in trigonometric form. x^2 + 1 - sqrt3i = 0 2.) Give the rectangular coordinates for the point. (9, 2pi/3) 3.) The rectangular coordinates of a point are given. Express the point in polar coordinates with r L 0 and 0° K ...

*Monday, December 8, 2014 by Anonymous*

**Trig (math)**

1.) Write the complex number in trigonometric form r(cos theta + i sin theta) with theta in the interval [0°, 360°). 9 sqrt 3 + 9i 2.) Find the product. Write the product in rectangular form, using exact values. [4 cis 30°] [5 cis 120°] 3.) [4(cos 135° + i sin 135°)][6(...

*Sunday, December 7, 2014 by Anonymous*

**trig**

Question #1 Suppose that θ is an angle in standard position whose terminal side intersects the unit circle at −−2029,2129 Find the exact values of cscθ cotθ sinθ .

*Saturday, December 6, 2014 by Kylee Smith*

**Math Trig**

Let theta be an angle in quad III such that sec theta = -13/5. Find the exact values of cot theta and sin theta? Thank you!!!

*Friday, December 5, 2014 by Uzi*

**Pre-Calc/Trig...**

Use the rules of logarithms to expand [(x+3)^4(x-5)^7]

*Friday, December 5, 2014 by Anonymous*

**Precalc/Trig**

2 roads intersect at an angle of 60 degrees. A friend's mail box is 434 feet from that intersection and your mailbox is on the other road and is 525 feet from the intersection. How far is it from your mailbox to your friend's mailbox? I got 1016.66 feet, but that is wrong. ...

*Thursday, December 4, 2014 by Heather*

**Pre-Calc/Trig...**

I have one way, but cant think of another? Show two ways of finding y if y = log4 64. Explain your thinking. 4^x=64 x=3

*Thursday, December 4, 2014 by Anonymous*

**Pre-Calc/Trig...**

Write the equation y = log x in exponential form.

*Thursday, December 4, 2014 by Anonymous*

**Pre-Calc/Trig...**

If An is defined as a geometric sequence, is the sequence 1/an also a geometric sequence? Explain your reasoning

*Wednesday, December 3, 2014 by Anonymous*

**Pre-Calc/Trig...**

is this the correct formula for me to solve this? A bacteria culture has 2,000 bacteria. The number of bacteria increases by 5% each hour. How many bacteria are there after 12 hours? 2,000*0.05^(12-1)

*Wednesday, December 3, 2014 by Anonymous*

**Pre-Calc/Trig...**

Find S5 for a geometric series for which a1 = 81 and r = 1/9.

*Wednesday, December 3, 2014 by Anonymous*

**Pre-Calc/Trig...**

Given a geometric sequence with a1 = 6 and r = 2/3, write an explicit formula for An, the nth term of the sequence.

*Wednesday, December 3, 2014 by Anonymous*

**Pre-Calc/Trig...**

The nth term of a geometric sequence is given by an = 1/4(4)^n-1. Write the first five terms of this sequence.

*Wednesday, December 3, 2014 by Anonymous*

**Pre-Calc/Trig...**

Write the equation y = bx in logarithmic form.

*Wednesday, December 3, 2014 by Anonymous*

**trig**

How much does it cost to paint a triangular surface of sides 6m,5m, and 11m at the rate of rs.20/-per metre square.

*Wednesday, December 3, 2014 by sanjay*

**trig**

a ship starts from port at a bearing of South 32 degrees East. It travels 8 miles in this direction before turning to a bearing of North 14 degrees East. It travels 15 miles in this direction, before finally turning to a bearing of South 72 degrees East and travels another 4 ...

*Tuesday, December 2, 2014 by adam*

**Trig**

a ships navigator determines that the ship is moving through the water at 17.5mi/h with a heading of 26.3 degrees north of east but the ship is actually moving at 19.3 mi/h in a direction of 33.7 degrees north of east. What is the velocity of the current? would this be 17....

*Monday, December 1, 2014 by Erica*

**Trig**

A jet is 115 mi east and 88.3 i north of Niagara Falls. What is its displacement from Niagara Falls?

*Monday, December 1, 2014 by Erica*

**Precalc/Trig**

I have no idea how to solve this one problem: Round to two decimal places. Two observers 25 feet apart, sight to the top of the tree. If the angle of elevation to the top of the tree from the observer closest to the tree is 30 degrees and the angle of elevation from the ...

*Monday, December 1, 2014 by Heather*

**trig**

Two circles of radii 5 and 3 cm, respectively, intersect at two points. At either point of intersection, the tangent lines to the circles form a 60◦ angle, as in Figure 2.2.4 above. Find the distance between the centers of the circles

*Sunday, November 30, 2014 by Anonymous*

**Trig**

I need help setting these up. 1.) Use the parallelogram rule to find the magnitude of the resultant force for the two forces shown in the figure. round to one decimal place. Theta= 35 degree, b=98 lbs, c=55lb 2.) Find the magnitude and direction angle for each vector. Five the...

*Wednesday, November 26, 2014 by Derrick*

**TRIG!**

true or false, the two sets of parametric equations x=t, y=t^2+1 and x=3t, y=9t^2+1 have the same graph. justify your decision.

*Tuesday, November 25, 2014 by PLEASE HELP*

**trig**

rewrite each equation in polar form. solve for r if possible a. 2x+3y=5 b. y=1/2x

*Tuesday, November 25, 2014 by trig*

**Trig**

Determine exact solution. x E (0, 2pi) 2csc^2x-8=0

*Tuesday, November 25, 2014 by Zoe*

**trig**

determine a set of parametric equations to represent the line segment that begins at the point(-2,6) and ends at the point (10,-4)

*Tuesday, November 25, 2014 by !*