Sunday
May 1, 2016

# Homework Help: Math: Trigonometry

## Recent Homework Questions About Trigonometry

Trig
(Cos/1-sin)- tan
Tuesday, December 8, 2015 by N

algebra 2 trig
lighthouse b is 9 miles west of lighthouse A. a boat leaves A and sails 5 miles. At this time, it is sighted from B. If the bearing of the boat from B is N64 E, how far from B is the boat?
Tuesday, December 8, 2015 by Anonymous

Trig
In still air, an airplane is flying at 100 mph. It encounters a wind blowing toward the west at 50 mph. What should be the plane's compass heading for its course to be N30ºW?
Monday, December 7, 2015 by Annie

trig
find the exact value of each expression. do not use a calculator. Sec 3.14/4 + 2 csc 3.14/3 4 + tan 2*3.14/3
Monday, December 7, 2015 by Anonymous

Math
Solve simultaneously for the two equations for x and y 5x(cos 45) + 15y(cos 30) = 2,000 5x(sin45) - 15y(sin 30) = 0 I tried adding these two eqn. to elimate y and solve for x by adding [5 x cos 45] and [5 x sin 45] but the value for x is too high. Would I have to use trig ...
Saturday, December 5, 2015 by Rose

Graphing Reciprocal Trig Functions
a) y=csc(x-3) I understand that there are asymptotes at 0, pi, and 2pi and I know how to graph the base points but I am confused on how to move it with the phase shift. Do I use a table of value for the asymptotes and base points to move?
Sunday, November 29, 2015 by Mandy

Solving Trig Equations
Solve for x in the interval [-pi,0] a) sin^2x = 3/4 I know that you have +root3/2 and -root3/2 and the positive one gives you an error when doing the inverse of sin, but im confused about the -root3/2. I found that one of the answers of x is -pi/3 (-60 degrees) which fits my ...
Friday, November 27, 2015 by Mandy

Precalc Trig
here's the question: solve for cos(2theta)=1 if you graph r= cos(2Theta) then graph r=1 you find that there are four places where the graphs intersect. however, when solved algebraically, there are two solutions which can be represented in an infinitely many format as: ...
Friday, November 20, 2015 by Wulramm

Trig right triangle
A ship leaves port at 6 am and heads due east at 20 knots. At 10 am, to avoid a storm the ship changes course to N 47°. Find the ships distance from port at 4 pm.
Tuesday, November 17, 2015 by Ken

Trigonometry
Use trig form to find quotient 3/(2+3i)
Tuesday, November 17, 2015 by Shannon

Trig
A ship leaves port at 6 am and heads due east at 20 knots. At 10 am, to avoid a storm the ship changes course to N 47° E.. (47° east of north). Find the ships distance from port at 4 pm.
Monday, November 16, 2015 by Isaac

Trig
I've done this one multiply times yet it never seems to work out, I'm supposed to simplify yet it never works out tan(csc^-1(x/x-1)) my first step; sin/cos(1/sin(x/x-1))
Monday, November 16, 2015 by Anna

Math
The current, I, in amperes, for an electric circuit is given by the formula I=4.3sin120(pi)t, where t is time, in seconds. a)At what time is the current at its max volume? How does your understanding of co terminal angles help in your solution? b)What time is the current at ...
Friday, November 13, 2015 by Bethany

Trig
Find all angles θ between 0° and 180° satisfying the given equation. (Enter your answers as a comma-separated list. Round your answers to one decimal place.) Sin θ = 1/4
Monday, November 9, 2015 by Amanda

Calculus
how do you solve this trig identity? i don't get it at all! cos(a+b)cos(a-b)=cos^2a-cos^2b-1
Monday, November 9, 2015 by sakura

trig
The angle of elevation from a point on the ground to the top of a tree is 38.7 degrees. The angle of elevation from a point 27 ft farther back to the top of the tree is 22.9 degrees. Find the height of the tree to 2 decimal places.
Monday, November 9, 2015 by jake

Physics
In a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. In one instance, the radius of the circle is 0.608 m. At one point on this circle, the ball has an ...
Wednesday, November 4, 2015 by Deven

trig
Find the component form of v and sketch the specified vector operations geometrically, where u = 4i − j, and w = i + 5j. v = −u + w v = ( , )
Monday, November 2, 2015 by Jose

trig
Find the magnitude and direction angle of the vector v. v = 4(cos 125°i + sin 125°j) ||v|| = θ =
Monday, November 2, 2015 by James

trig
Find the component form of v given its magnitude and the angle it makes with the positive x-axis. Sketch v. Magnitude Angle ||v||= 7/2 45 degrees v=( , )
Monday, November 2, 2015 by amanda

trig
An airplane is flying in the direction 148° with an airspeed of u = 920 kilometers per hour. Because of the wind, its groundspeed and direction are v = 820 kilometers per hour and 140°, respectively (see figure). Find the direction and speed of the wind.
Monday, November 2, 2015 by bob

Trig application
I can't figure this out. A famous golfer tees off on a long, straight 459 yard par 4 and slices his drive 10 degrees to the right of the line from tee to the hole. If the drive went 288 yards, how many yards will the golfer's second shot have to be to reach the hole?
Thursday, October 29, 2015 by William

Trig
I need help with this application. A pier 1250 meters long extends at an angle from the shoreline. A surveyor walks to a point 1500 meters down the shoreline from the pier and measures the angle formed by the ends of the pier. It is found to be 53 degrees. What acute angle ( ...
Tuesday, October 27, 2015 by Hutch

Math
Find the exact value of the trig expression given that sin u = -5/13 and cos v = -4/5. u and v are in the second quadrant. cos(v - u)
Sunday, October 25, 2015 by Anonymous

trig
an electric hoist is used to life a piece of equipment y = 2.6 feet. the diameter on the hoist is x = 12 inches. find the number of degrees through which the drum must rotate (round to the nearest integer). *I do apologize, there is a figure in my question, but I cannot paste ...
Wednesday, October 21, 2015 by xiahou

Trig
mercury rotates around the sun in approx. 89 earth days (or 7,689,600 s. use a calculator to approximate its angular speed. choices: 4.09x10^-7 0.035 0.071 8.17x10^-7
Wednesday, October 21, 2015 by Bill

Trig
a smokestack is 190 feet high. a guy wire must be fastened to the stack 30.0 feet from the top. the guy wire makes an angle of 39.0deg with the ground. find the length of the guy wire
Wednesday, October 21, 2015 by Struggler in math

Math (Trig)
A ship leaves port at noon and has a bearing of S 25° W. The ship sails at 15 knots. How many nautical miles south and how many nautical miles west does the ship travel by 6:00 P.M.? (Round your answers to two decimal places.) Miles South? Miles West?
Wednesday, October 21, 2015 by Rafael

Trig
The width of the box is 9 inch more than its length and the height of the box is 1 inch less than its length write an expression for the volume of the box
Thursday, October 15, 2015 by Jim

functions and trig
write the transformation of X cubed if it is shifted right four units and then reflected over the X axis
Monday, October 12, 2015 by sarah

physics
The problem propmpts us with the info: "Two friends play with a card-board box on a grassy hill side. The boy in the box has a mass of 50.0 kg and the box has a mass of 5.00 kg. The incline of the hill is 44° and its height is 10 meter. Assume that friction plays a ...
Sunday, October 11, 2015 by ana

trig
given cotθ = (1/2) √7, find sinθ and cosθ in quadrant I cotθ = x/y would 1/2 be the x and √7 be the y?
Saturday, October 10, 2015 by coco

trig
1) given cotθ = 1/2√7, find sinθ and cosθ in quadrant I 2) given tanθ = √5, find secθ and cotθ in quadrant III
Saturday, October 10, 2015 by coco

precalculus
find the values of the requested trig functions using the given value and quadrant in which the point corresponding to the angle lies. quadrant II; sinθ=4/5 find cosθ and tan θ
Saturday, October 10, 2015 by glen

math
identify all of the basic trig functions that fit each description. 1) is negative for angles in the 2nd and 4th quadrant 2) is unbounded answer: tan, cot 3) has a range of -1 ≤ y ≤ 1 answer: sin, cos are my answers correct? and i'm not sure what the answer to ...
Friday, October 9, 2015 by stewie

Trig
Having completed another stimulating school day, Michael and Alyssia both leave at the same time. They walk together for a while and then go their separate ways. These paths make a 60° angle with one another. Michael toddles along at 2ft/sec, while Alyssia speeds off at ...
Friday, October 9, 2015 by Anon

Physics/trig
A fire hose ejects a stream of water at an angle of 33.6 ° above the horizontal. The water leaves the nozzle with a speed of 29.6 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?
Friday, October 9, 2015 by Jenna

trig
1) cos^2(x)/sin^2(x) 2) tan(x)cot(x)-sin^2(x) 3) 1-sin(x)cos(x)tan(x)
Thursday, October 8, 2015 by gen

Math (Trig)
A triangle ABC has a trisected angle A. The angle trisectors divide side a (opposite angle A) into three segments which are BD, DE, and DC. The lengths are 2, 3, and 6, respectively. What are the lengths of the other sides?
Monday, October 5, 2015 by Z

trig
The angle relative to the horizontal from the top of a tree to a point 12 feet from its base(on flat ground) is 30*. Find the height of the tree.
Wednesday, September 30, 2015 by rita

calculus
1. what trig function has an amplitue of 1 and negative values for angles between π/2 and π? 2. what trig function never crosses the x-axis and has a value of 2 at π/6? are these correct? 3. what trig function has a period of π and is undefined for -π/...
Monday, September 28, 2015 by anon

trig
A skateboard wheel has a radius of 2.08 inches and is turning at a rate of 945 rpm. a. what is the angular speed in radians per second? in degrees per second? b. how fast is the skateboard traveling (in miles per hour)?
Saturday, September 26, 2015 by Mohamad

Precalc
Identify all of the trig functions that fit each description: 1. Has a amplitude of 1 2. Is discontinuous at odd multiples of π/2 3. Is continuous at odd multiples of π/2 4. Has sin x as a denominator value 5. Is completely bounded 6. Has the exxact same value at &#...
Tuesday, September 22, 2015 by Anon

Trigonometry
find the value for the indicated trig function for ø, if ø is an angle in standard position with the terminal side defined by the given point. (18,24); find cos ø
Tuesday, September 22, 2015 by Kimmy

Trig
The foot of a ladder is on level ground 1.5m from a wall. The ladder leans agents the wall. The angle formed by the ladder and the ground is 70 degrees. Calculate how high up the wall the ladder reaches.
Tuesday, September 15, 2015 by Emily

trig
If each leg has length 5 meters, what are the lengths of the other leg and the hypotenuse
Thursday, September 10, 2015 by drake

Math Trig
A plane's flight path called for it to fly from J to W. W is 200kms due North and 500kms due west of J. Draw a coordinate picture. What bearing will the pilot fly and what distance will he or she go in air kilometers?
Monday, September 7, 2015 by K

Physics/trig
During takeoff, an airplane climbs with a speed of 300 m/s at an angle of 36 degrees above the horizontal. The speed and direction of the airplane constitute a vector quantity known as the velocity. The sun is shining directly overhead. How fast is the shadow of the plane ...
Thursday, September 3, 2015 by Jenna

Trig
Evaluate the following expression: sin(cos^-1(12/13)) tan(sin^-1(3/5)) I do not know what the inverse values would be...how would I work through this?
Wednesday, August 26, 2015 by Lillian

Trig
Find all solutions of the equation in the interval [0,2pi). 2sin theta+1=0. Write answer in radians in terms of pi.
Wednesday, August 19, 2015 by James

Trig
cos 13 pi = ?
Saturday, August 8, 2015 by Anonymous

math trig
Solve for x if 3sin2x - 3sinx = 2 - 4cosx 0<x<180
Tuesday, August 4, 2015 by ntsoaki

trig
If sinx=3 cosx, then what is sinx∙cosx?
Thursday, July 30, 2015 by Alexa

Trig
Solve, algebraically or with justification (no graphing calculator solutions allowed), the following equation: tan⁡7x-sin⁡6x=cos⁡4x-c​ot⁡7x
Thursday, July 30, 2015 by Alecs

Trig
What is the value of tan⁡x given that sin⁡x+cos⁡x=1/5 and π/2<x<π ?
Thursday, July 30, 2015 by Erikhelp

Trig
Algebraically find the value of: 10 cot⁡(cot^(-1)⁡3+cot^(-1)R​89;7+cot^(-1)⁡13+cot^(-1)⁡21​ )
Thursday, July 30, 2015 by Erikhelp

Trig
Write an algebraic expression for the following: sin⁡(arctan⁡〖(x+1)/(x​-1)〗 )
Thursday, July 30, 2015 by Alexa

Trig
Prove the identity: (sin⁡(2x-y)+sin⁡y)/(cos̼​9;(2x-y)+cos⁡y )=tan⁡x
Thursday, July 30, 2015 by Alexa

trig
The hypotenuse of a right triangle has length 8. The area of the triangle is also 8 units squared. What is the perimeter of the triangle?
Wednesday, July 29, 2015 by Alexa

trig
what is terminal point of 5pi/4?
Tuesday, July 28, 2015 by KLL

trig
A road has a 10% grade (slope). To the nearest degree what is the angle of elevation of the road?
Tuesday, July 14, 2015 by Lake

Maths trig
Sketch the graphs of f(x)=3overx+1 and g(x)=-2x-4 on the same set of axes
Wednesday, June 17, 2015 by Lulu

Maths trig
Sketch the graphs of f(x)=3overx+1 and g(x)=-2x-4
Wednesday, June 17, 2015 by Lulu

trig
Help with simplest form sin(2pift - pi) + sin(2pift + pi)
Tuesday, June 16, 2015 by sheree

trig
A radio transmission tower is 471.0 feet tall. A guy wire is to be attached 6 feet from the top and is to make an angle of 23.1 degrees with the ground? How many feet long should the guy wire be? I am confused on how to find the equation for this problem so that I may work it ...
Tuesday, June 16, 2015 by Coaco

Trig/ algebra 2
if f(x) = sin4x-cos2x, find f(pi/8)
Wednesday, June 10, 2015 by Mika

Trig/Geometry
Wendy spots a pizza delivery car as she is looking down at a 15° angle from the top of her apartment building, which is 145 ft tall. How far away is the car from the base of the building? Round to the nearest hundredth. A. 45.98 ft B. 3.56 ft C. 38.85 ft D. 68.78 ft I keep...
Thursday, May 28, 2015 by Rothko

trig
An airplane is heading north at an airspeed of 500 km/hr, but there is a wind blowing from the northwest at 50 km/hr. how many degrees off course will the plane end up flying, and what is the plane's speed relative to the ground? So here is my work... 50cos(45)+500= 535....
Thursday, May 28, 2015 by Dan

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 by Anonymous

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 by Anonymous

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 by Anonymous

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 by caroline

Trig
Solve each equation for the given domain. cos^2 theta + cos theta - 1 = 0 for 0-180.
Saturday, May 16, 2015 by Anonymous

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 by Anonymous

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 by Taylor

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 by Ryan

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 by thrish

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 by thrish

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 by thrish

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 by Anonymous

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 by Sally

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 by Anonymous

Trig
secθsinθ is equivalent to: Ans: tanθ?
Wednesday, May 6, 2015 by Anonymous

trig
2-sec=5+sec
Monday, May 4, 2015 by genny

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 by justin

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 by lynn

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 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 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