Friday
May 22, 2015

Homework Help: Math: Trigonometry

Recent Homework Questions About Trigonometry

Trig
Find sin2theta, cos2theta, and tan2theta for costheta = -12/13 in pi < theta < 3pi/2. My answers: 20111/24336 for tan2theta. 144/169 for cos2theta -120/338 for sin2theta
Wednesday, May 20, 2015 at 7:38pm

Trig
For 90<theta<180, cos theta = -(5/13). Which is sin theta? 1. - sqrt 13/9 2. - sqrt 9/13 3. sqrt 9/13 4. sqrt 13/9 3?
Wednesday, May 20, 2015 at 3:58pm

Trig
Which is cos2 theta if sin theta = -2/sqrt13 and 180 < theta < 270? 1. -(13/5) 2. -(5/13) 3. 5/13 4. 13/5 3?
Wednesday, May 20, 2015 at 12:32pm

algebra 2 and trig
The scores on a chemistry test are normally distributed. Approximately 95 percent of the scores fell between 78 and 92. What is the standard deviation for this distribution?
Monday, May 18, 2015 at 7:45pm

Trig
Solve each equation for the given domain. cos^2 theta + cos theta - 1 = 0 for 0-180.
Saturday, May 16, 2015 at 8:05pm

Trig
Solve the equation for the given domain. 4cos^2 θ = 1 for 0 to 360 degrees. I get 60, 120, 240, and 300. Are these correct? If so, how would I represent them with some sort of expression?
Saturday, May 16, 2015 at 6:03pm

Trig Identities
Prove the following identities: 13. tan(x) + sec(x) = (cos(x)) / (1-sin(x)) *Sorry for any confusing parenthesis.* My work: I simplified the left side to a. ((sinx) / (cosx)) + (1 / cosx) , then b. (sinx + 1) / cosx = (cos(x)) / (1-sin(x)) I don't know how to verify the ...
Tuesday, May 12, 2015 at 9:09pm

Trig identities
Sin x/[1-cos(-x)] = csc x + cot x Please Verify the Identity. I have been going in circle with this one... Just a hint would be nice. Thank you.
Tuesday, May 12, 2015 at 10:48am

trig
a vertical pole 35 feet high, standing on sloping ground, is braced by a wire which extends from the top of the pole to a point on the ground 25 feet from the foot of the pole. If the pole subtends an angle of 30 degree at the point where the wire reaches the ground, how long ...
Sunday, May 10, 2015 at 2:34am

Trig
A ladder 35.4 feet long is leaning against an embarkment inclined 62.5 degrees to the horizontal. If the bottom of the ladder is 10.2 feet from the embarkment, what is the distance from the top of the ladder down the embarkment to the ground?
Sunday, May 10, 2015 at 2:30am

trig
From a certain point, the angle of elevation of the top of the building is 38. From a point 75 feet nearer the building, the angle of elevation is 65. Find the height of the building.
Saturday, May 9, 2015 at 11:22pm

Trig
Two pilots take off from the same airport. Mason heads due south. Nancy heads 23 west of south. After 400 land miles, how far is Nancy from Mason’s route? I think 156.29, but I'm not sure because the question comes in a lesson on sum and difference identities...
Saturday, May 9, 2015 at 8:20pm

Trig
Find sin(s+t) and (s-t) if cos(s)= 1/5 and sin(t) = 3/5 and s and t are in quadrant 1. =Sin(s)cos(t) + Cos(s)Sin(t) =Sin(1/5)Cos(3/5) + Cos(-1/5)Sin(3/5) = 0.389418 Sin(s-t) =sin(s)cos(t) - cos(s)sin(t) =sin(-3/5)cos(1/5) - cos(1/5)sin(3/5) =Sin-3/5 cos-3/5 = -0.46602 HELP ...
Thursday, May 7, 2015 at 9:47am

Trig
Find each value if sin A = 12/13 with 90 degrees <= A <= 270 degrees and if sin B = -7/25 with -90 degrees <= B <= 90 degrees. sin(A - B) sin(A + B)
Wednesday, May 6, 2015 at 6:17pm

Trig
secθsinθ is equivalent to: Ans: tanθ?
Wednesday, May 6, 2015 at 12:55pm

trig
2-sec=5+sec
Monday, May 4, 2015 at 4:27pm

trig
Find the values of sin 0, cos 0, and tan 0ƒáif the angle 0ƒáis in standard position and its terminal side passes through the point (¡V15, 8). Give answers as fractions.
Sunday, May 3, 2015 at 12:28pm

trig
Find the bearing and airspeed for a plane to fly 630 miles due north in 3 hours if the wind is blowing from a direction of 318* and is blowing at 15mph. Approximate the bearing to the nearest degree and the speed to the nearest mile per hour.
Tuesday, April 28, 2015 at 4:37pm

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 at 2:13pm

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 at 4:24am

Trig
If tan x = -sq rt3/3 and cos x = -sq rt3/2, the measure of <x is?
Friday, April 24, 2015 at 2:15pm

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 at 7:08pm

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 at 9:13am

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 at 8:43am

Trig
Prove that : (Sin Ө + Cosec Ө)/(Tan Ө+Cot Ө) = Sin Ө + Cos Ө
Sunday, April 19, 2015 at 5:03pm

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 at 4:55pm

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 at 4:49pm

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 at 1:06am

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 at 6:44pm

trig
solve triangle ABC which have angleA=25.25,angleB=60.51 and a=3.82..find c...,find b
Saturday, April 11, 2015 at 1:27pm

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 dont 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 at 11:46am

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 at 12:51am

trig
How do I verify this? Cos^4x-Sin^4x=1-tan^2x/sec^2x
Thursday, April 2, 2015 at 4:08pm

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 at 3:40am

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 at 8:25am

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 at 8:39pm

trig
y= 3 cos(x+pi)-3
Thursday, March 19, 2015 at 9:42pm

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 at 9:54pm

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 at 8:39pm

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 at 11:55pm

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 at 12:36am

Trig
How do you derive this identity? Cos(t)=1-sin^2(t/2)
Wednesday, March 11, 2015 at 6:16am

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 at 7:07pm

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 at 1:50pm

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 at 1:58pm

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 at 10:09pm

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 at 9:38pm

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

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

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Homework Help: Math

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