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March 3, 2015

Homework Help: Math: Trigonometry

Recent Homework Questions About Trigonometry

Post a New Question | Current Questions

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 at 5:51pm

trig
what is the reference angle for 11π/6? how would i do this?
Friday, February 27, 2015 at 2:17pm

INTEIER DESIGN
When you have completed your exam and reviewed your answers, click Submit Exam. Answers will not be recorded until you hit Submit Exam. If you need to exit before completing the exam, click Cancel Exam. Questions 1 to 20: Select the best answer to each question. Note that a ...
Thursday, February 26, 2015 at 12:45am

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 at 6:30pm

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 at 6:11pm

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 at 8:20pm

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 at 6:48pm

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 at 6:18pm

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 ...
Saturday, February 21, 2015 at 12:13am

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 at 5:42pm

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 at 11:52am

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 at 3:58pm

Calculus
Integration with trig functions Integral of [(1-sinx)/cos^2x] dx
Thursday, February 12, 2015 at 11:58pm

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 at 9:24pm

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 at 12:13am

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 at 6:45pm

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 at 6:18pm

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 at 5:45am

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 at 5:40am

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 at 11:08pm

Trig
How do i solve sinx/cosx(sinx+cosx/sinx×cosx)=sec​x? I know it's 1/cosx because it equals secx but I don't know how to get there? :^(
Thursday, February 5, 2015 at 8:22pm

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 at 1:05pm

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 at 9:53pm

Trig 4
Can someone break down the meaning of sin, tan, and cos into simpler more understandable terms?
Sunday, January 25, 2015 at 3:32am

Trig/ English
I need an Acrostic poem for the word "Exponent"
Thursday, January 22, 2015 at 10:07am

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...
Wednesday, January 21, 2015 at 5:59pm

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 at 9:32pm

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 at 1:32pm

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 at 5:40am

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 at 1:40pm

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 at 8:09am

Pre-calc/trig
5=log3(x^2+18)
Sunday, January 4, 2015 at 5:51pm

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 at 2:37pm

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)+co​s(cx)+cos(dx) for all values of x. ...
Sunday, January 4, 2015 at 1:46pm

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 at 1:42pm

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 at 10:19am

Pre-Calc/Trig
A potato is put into an oven that has been heated to 350F. Its temperature as a function of time is given by T(t) = a(1 - e-kt) + b. The potato was 50F when it was first put into the oven. if the potato is 60F after 2 minutes, what is the value of k? ...
Tuesday, December 30, 2014 at 9:44pm

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...
Tuesday, December 30, 2014 at 9:30pm

Pre-Trig/Calc
Please help :) A potato is put into an oven that has been heated to 350F. Its temperature as a function of time is given by T(t) = a(1 - e-kt) + b. The potato was 50F when it was first put into the oven. What is the value of b in this context? Explain. What is ...
Monday, December 29, 2014 at 9:40pm

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 ...
Tuesday, December 16, 2014 at 7:40pm

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 at 10:27pm

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 at 11:06am

Pre-Calc/Trig...
what is In e^4.3 equivalent to? How?
Wednesday, December 10, 2014 at 1:49pm

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 at 11:14am

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 at 2:25pm

trig
Solve R=3(1-sin theta) and graph
Monday, December 8, 2014 at 11:21am

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 at 1:01am

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 at 12:21am

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 ...
Sunday, December 7, 2014 at 11:23pm

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 at 2:49pm

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 at 3:11pm

Pre-Calc/Trig...
Use the rules of logarithms to expand [(x+3)^4(x-5)^7]
Friday, December 5, 2014 at 11:30am

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 ...
Thursday, December 4, 2014 at 11:18pm

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 at 1:20pm

Pre-Calc/Trig...
Write the equation y = log x in exponential form.
Thursday, December 4, 2014 at 12:42pm

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 at 6:12pm

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 at 5:47pm

Pre-Calc/Trig...
Find S5 for a geometric series for which a1 = 81 and r = 1/9.
Wednesday, December 3, 2014 at 5:33pm

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 at 4:34pm

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 at 12:10pm

Pre-Calc/Trig...
Write the equation y = bx in logarithmic form.
Wednesday, December 3, 2014 at 11:21am

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 at 8:28am

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 at 7:50pm

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 at 12:43pm

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 at 10:09am

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 at 1:25am

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 at 11:15pm

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 at 7:17pm

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 at 11:22pm

trig
rewrite each equation in polar form. solve for r if possible a. 2x+3y=5 b. y=1/2x
Tuesday, November 25, 2014 at 9:57pm

Trig
Determine exact solution. x E (0, 2pi) 2csc^2x-8=0
Tuesday, November 25, 2014 at 8:50pm

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 at 8:36pm

trig
solve each equation if 0 < x < 2pi. answer must be in radians 1. 4 cos x - 2 = 0 2. 3 sec^2 - 4 = 0
Monday, November 24, 2014 at 6:09pm

Pre-Calc/Trig
is the integer n odd or even, explain
Monday, November 24, 2014 at 2:39pm

Pre-Calc/Trig
Help me please, I don't understand this write using exponential notation √ 36* 3√ 64 oh and 3 is an exponent
Monday, November 24, 2014 at 10:51am

Trig
Does this result in no triangle, 1 or 2 triangles? If so, then solve. B= 88 degrees, b= 4 and a=23. I know that A= (sin 88)(23)/(4)= A=5.74 degrees C= 180-5.74-88= C=86.26 degrees c=(sin86.26)(4)/(sin 88)= c=3.99 My question is how do you know if it's 0,1, or 2 triangles. ...
Sunday, November 23, 2014 at 11:38pm

Trig- math
Find the area of a triangle if the sides of the triangle have the lengths 849mi, 930mi, and 1301mi. Here's my work: a=849 b=930 c=1301 A=.5(849)(930)sinA sin A = 394,785 mi^2 (this number doesn't seem right to me, can you explain to me what I did wrong)?
Sunday, November 23, 2014 at 7:25pm

trig
I need help setting this problem up. A force of 36lb is required to hold a 70lb toolbox on an incline. What angle does the incline make with the horizontal?
Sunday, November 23, 2014 at 7:18pm

Trig
I need help with my vectors unit. I'm really confused about how to set them up. Please help. a.) Given u=2i-5j and v=-i+3j, determine -6u-3v? b.) Find the component form of v if |v|=4 and the angle it makes with the x-axis is 60 degree. c.) Given u=5i+3j and v+3i+2j, find...
Sunday, November 23, 2014 at 7:03pm

Trig
Find the magnitude and direction angle for each vector. Give the measure of teh direction angle as an angle in [0,360]. <5sqrt2,-5sqrt2>
Sunday, November 23, 2014 at 2:00am

Math (trig)
The distance from home plate to dead center field in a certain baseball stadium is 409 feet. A baseball diamond is square with a distance from home plate to first plate base 90 feet. How far is it from first base to dead center field? I also need help setting this up.
Sunday, November 23, 2014 at 1:58am

Math (trig)
A force of 35lb is required to hold a 72lb toolbox on an incline. What angle does the incline make with the horizontal? Please help me set this up.
Sunday, November 23, 2014 at 1:56am

Trig
Two tracking stations are on the equator 161 miles apart. A weather balloon is located on a bearing of N 32°E from the western station and on a bearing of N 16°E from the eastern station. How far is the balloon from the western station? Round to the nearest mile.
Wednesday, November 19, 2014 at 8:30pm

trig
a boat is tied by a rope 12 meters long to a ring that is 3.5 meters above the water.If the rope is taut find the angle it makes with the water?
Tuesday, November 18, 2014 at 7:50am

Trig
Jane has a bike with a 22-inch rear wheel. The wheel sprocket is 3 inches in diameter and the pedal sprocket is 4 inches in diameter (the sprockets hold the chain.) How fast in miles per hour is she going if she pedals at a rate of 100 revolutions per minute?
Monday, November 17, 2014 at 8:33pm

Trig
the angle of elevation to the sun is 65 degrees. A building casts a shadow 16m long. What is the height of the building to the nearest meter?
Monday, November 17, 2014 at 7:43pm

Pre-Calc/Trig
Go over this with me please, I forgot how to do it. Solve the polynomial equation. 15x^3-119x^2-10x+16=0
Monday, November 17, 2014 at 12:36pm

trig
From the top of a tower of height 75m, a man sees two goats, both due west of him. If the angles of depression of the two goats are 10 degrees and 17 degrees, calculate the distance between them. It wants the angle of depression. I , myself, don't understand the question ...
Monday, November 17, 2014 at 3:37am

Derivative
Can you help me find the derivative of y= cos(x)/1+sin(x).. the / is a fraction bar. I have a hard time finding trig derivatives because I don't really know what the derivative of cos,sin ,or tan would be honestly.
Sunday, November 16, 2014 at 9:17pm

Trig
Determine the intervals of continuity of f(x)= ln(sin(x)) I looked at the graph and I have no idea how to state the intervals.
Sunday, November 16, 2014 at 5:27pm

Math
This one confused me since it revolved around what seemed like dividing trig function by another function Write the following expression in terms of the tangent function 2 / ((cos(r^2 - s^2) / (sin(r^2 - s^2)) = ? I know tan t = sin t / cos t. So would I multiply by the ...
Friday, November 14, 2014 at 1:37pm

Pre-Calc/Trig
Identify the asymptotes, removable discontinuities, and intercepts for the graph of the function. d(x)=(x^2-12x+20)/3x
Friday, November 14, 2014 at 12:29pm

Pre-Calc/Trig
What are the polynomial names for these functions. 1.) m(x)=x+x^2-1 2.) d(x)=x+ 3.14 3.) 2-6x^2+11x^3
Friday, November 14, 2014 at 11:35am

Trig/Pre-Calc
Solve the polynomial equation. 15x^3-119x^2-10x+16=0
Thursday, November 13, 2014 at 5:32pm

Pre-Calc/Trig
State the domain and range for each function. y=2x^2/(x^2-1) domain: ? range: ?
Wednesday, November 12, 2014 at 4:58pm

Pre-Calc/Trig...
Write a function with the following characteristics: A vertical asymptote at x=3 A horizontal asymptote at y=2 An x-intercept at x=-5
Wednesday, November 12, 2014 at 2:38pm

Pre-Calc/Trig
Identify the extrema for the function. Classify it as a relative (local) or absolute (global) maximum or minimum value. f(x)=4x^3-12x^2+15
Tuesday, November 11, 2014 at 4:37pm

math
Use Green's Theorem to evaluate F(x, y) = y cos x − xy sin x, xy + x cos x , C is the triangle from (0, 0) to (0, 4) to (2, 0) to (0, 0) I kind of understand how to do this , but I am having trouble with the trig
Tuesday, November 11, 2014 at 2:43pm

Pre-Calc/Trig
Describe the end behavior for function by writing a limit expression. f(x)=2x^5-x+7
Tuesday, November 11, 2014 at 1:13pm

Precalc/Trig
Sorry there are quite a few problems, but I just need to know if these are correct (and if they aren't, where I went wrong): 1. Solve these equations. tanθ = -√3 θ = 2π/3 + kπ θ = 5π/3 + kπ 2. secθ = √2 θ = π/4...
Tuesday, November 11, 2014 at 8:47am

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