Monday
February 20, 2017

# Homework Help: Math: Trigonometry

## Recent Homework Questions About Trigonometry

Math - Calc/Algebra/Trig
I'm trying to find all the points on the graph y=4/3cos^3x-cosx where the tangent line is horizontal. I took the derivative, which gave me: -4cos^2(x)sin(x)+sin(x) Now I need to solve it for x and I'm not sure how. Can you help?
Thursday, February 16, 2017 by Jamie

Calculus Question! ASAP!
Hello! I have this problem: x(dx)/sqrt(9-x^2) I was wondering why I can't use trig substitution and substitute sqrt(9-x^2) for sqrt(1-sec^2) and having: integral x = 3sin(theta) dx = 3cos(theta)d(theata) integral 3sin(theta)(3cos(theta))/3cos(theta) having the 3cos(theta) ...
Wednesday, February 15, 2017 by Lucy

Trig
Solve for t algebraically: inverse cos(t) = inverse sin(t). Where do I start?
Monday, February 6, 2017 by Anonymous

Alg/Trig
If h= -16t^2 + 112t represents the height of a​ rocket, in​ feet, t seconds after it was​ fired, when will the rocket hit the​ ground? (Hint: The rocket is on the ground when h equals=​0).
Sunday, February 5, 2017 by Sydney

Trig Practice
Find the exact value of sinA where a=9 and b=10 and angle C is a right angle. a. sin A= 9/sqrt 181, cos A= sqrt 181/10 b. sin A= sqrt 181/9, cos A= 10/sqrt 181 c. sin A= 9/sqrt 181, cos A= 10/sqrt 181 d. sin A=sqrt181/10, cos A= 9/sqrt 181
Friday, February 3, 2017 by Anonymous

trig
in triangle QRS, q=10.2m, r=20.5m, s12.8m..Solvetriangle QRS by determining the measurements of each degree to the nearest tenth of a degree
Monday, January 30, 2017 by dee

Trig
4x+y=​0, x≥0 help finding Sin, Cos, Tan for this
Thursday, January 26, 2017 by Ashley

Trig
can sec θ = negative 5
Thursday, January 26, 2017 by Ashley

trig
sin, cos, and tan for −5x + y =​0, x is less than or equal to 0
Thursday, January 26, 2017 by Ashley

Trig
Find the approximate value of cot θ​, given that csc θequals=3.5891420 and θ is in quadrant I.
Thursday, January 26, 2017 by Ashley

Geometry/Trig
A painter is placing a ladder to reach the third story window, which is 18 feet above the ground and makes an angle with the ground of 80°. How far out from the building does the base of the ladder need to be positioned? Round your answer to the nearest tenth. The base of the...
Wednesday, January 25, 2017 by Sosa

Geometry / Trig
What is the area of a regular hexagon with a distance from its center to a vertex of 1 cm? (Hint: A regular hexagon can be divided into six equilateral triangles.) hex The area of the regular hexagon is _____ ?
Wednesday, January 25, 2017 by Sosa

trig
Reiny 2+1/3*tan(theta)=2 How do you get 0? Thanks for your help.
Tuesday, January 24, 2017 by Sally

Trig
2+1/3tan(theta)=2 I know that tan=0 0,180 But i don't know how to figure it out. Please help.
Tuesday, January 24, 2017 by Sally

Trig
4=5+cos(theta)
Tuesday, January 24, 2017 by Sally

Trig
Thank you Steve for all your help.
Tuesday, January 24, 2017 by Sally

Trig
Solve equation for 0 less than or equal to theta less than 360. 3-1/5*tan(theta)=16/5
Tuesday, January 24, 2017 by Sally

trig
Brian is riding a Ferris wheel. The wheel has a radius of 25 feet, and at his lowest point, Brian is 8 feet off the ground. Brian times how long it takes to travel from the lowest point to the highest point and finds that it takes 8 seconds. Write a sinusoidal equation to ...
Saturday, January 21, 2017 by bobby

Pre-cal/trig
A dog is attached to a 21​-foot rope fastened to the outside corner of a​ fenced-in garden that measures 18 feet by 22 feet. Assuming that the dog cannot enter the​ garden, compute the exact area that the dog can wander. I'm confused as to how they want me to solve this...
Wednesday, January 18, 2017 by Aiden

Trig
An isosceles triangle has a height of 12.5 m (measured from the unequal side) and two equal angles that measure 55°. Determine the area of the triangle. Split in half the triangle is a right triangle, so it's three angles are 90%, 55% and 70%. I'm still not sure how to find ...
Tuesday, January 10, 2017 by R

Trig/PreCalc
Find a parametrization for the line segment with endpoints (5,2) and (-2, -4).
Tuesday, January 10, 2017 by William

Trig/PreCalc
Use an algebraic method to eliminate the parameter and identify the graph of the parametric curve. x=5-3t y=2+t -1<-x-<3
Tuesday, January 10, 2017 by Diane

Trig/PreCalc
Find the interior angles of the triangle with vertices (-4,1), (1,-6), and (5,-1)
Tuesday, January 10, 2017 by Maria

Trig/PreCalc
An airplane is flying on a compass heading of 160 degrees at 425 mph. A wind is blowing with the bearing 200 degrees at 75 mph. Find the actual speed and direction of the airplane.
Tuesday, January 10, 2017 by Susan

trig
A person is standing 90 feet away from the Space Needle. The person looks up at the Space Needle at an angle of elevation of 81 degrees. The distance from the floor to the person's eye level is 5 feet. What must be the height of the Space Needle?
Tuesday, January 10, 2017 by Vanni

Trig
Let n be a fixed positive integer. Describe all solutions of sin(n theta) = 1/2 I know that the solutions would be (π/6)/n+(2πx)/n and (5π/6)/n+(2πx)/n ? How do I 'describe'
Sunday, January 8, 2017 by Ryan

Trig
Given: sin x = 4/5, 0 < x < π/2 sin y = 5/13, π/2 < y < π Find the exact value of sin(x + y) I presume I'm supposed to use the sum and difference formulas but I'm not sure how to get the exactly value of cos x or cos y
Wednesday, January 4, 2017 by R

trig prove plz anyone help
Prove that: x - tan^-1(x) = tan^-1{(tanx - x)/(xtanx + 1)} plz help
Tuesday, December 27, 2016 by ...

Math - Trig / Pre - Calc
Standard form of hyperbola: Hyperbola: Vertices: (9,9), (9, -7) Foci: (9, 1 + 4 sqrt 13), (9, 1 - 4 sqrt 13)? Standard form Ellipse: vertices: (2 sqrt 10, -10), (-2 sqrt 10, -10) foci: (sqrt 30, -10), (-sqrt 30, -10)?
Wednesday, December 21, 2016 by Lilly

Math trig
Two towers 50 meters apart from the top of the shorter tower to the top of the taller tower 43 degree elevation, depression from the top of shorter tower to the bottom of the taller tower is 36 degrees what is the height of each tower?
Tuesday, December 20, 2016 by Shania

Trig Question
Find solutions of the following equation which lie in the interval [0,2pi): 6cos(3theta)/(2)+3=0
Tuesday, December 13, 2016 by Amy

Trig identities
Has a negative -5/13 Steve. If angles x and y are in the same quadrant and sin x =3/5 and cos y= -5/13 determine the value of sin (x-y)
Thursday, December 8, 2016 by Luke

Trig
Cicero has a population of 6200 people and is growing at a rate of 8% per year . Mattydale has a population of 8750 and is growing at a rate of 6% per year create and equation solve the problem and in how many years to the nearest year will Cicero have a greater population ...
Tuesday, December 6, 2016 by Christian

trig
The rectangular coordinates of a point are given (0,-6). Find polar coordinates of the point such that r greater than 0 and 0 less than or equals theta less than 2pi. how to solve this damon please help me
Monday, November 28, 2016 by Asfand

trig
The rectangular coordinates of a point are given (-5,-5root3). Find polar coordinates of the point. Express theta in radians.
Monday, November 28, 2016 by Asfand

Math
Consider ∠C such that sin C = 7/25 a) What are the possible quadrants in which ∠C may lie? b) If you know that cos C is negative, how does your answer to part a) change? c) Sketch a diagram to represent ∠C in standard position, given that the condition in part b) is true...
Tuesday, November 22, 2016 by Katie

Trig
What are the focus and directrix of the parabola represented by the equation:8(y-6)=(x+2)squared?
Monday, November 21, 2016 by Emily

Trig
From a point A, 30 meters from the base of a building B, the angle of elevationto the top of the building C is 56 degrees. The angle of elevation to the top of flagpole D on top of the building is 60 degrees. Find the length of flagpole CD
Sunday, November 20, 2016 by Ellie

Trig
Find the exact value of the trigonometric function given that sin u=3/5 and cos v=-8/17. Both u and v are in quadrant II. Tan (u+v)
Monday, November 14, 2016 by Lynn

Trig
find the angle between u=7i+2j and v=-4j
Wednesday, November 9, 2016 by Iris

trig help
simplify cosec40(sin40+sin80+cos120) help step
Monday, November 7, 2016 by Anonymous

trig help
simplify cosec40(sin40+sin80+cos120) help step
Monday, November 7, 2016 by Anonymous

trig
A communication tower is 34m tall. Jane stands somewhere in front of the tower to the right and measures the angle of elevation to be 70 degrees. Bill stands somewhere in front of the tower to the left and measures the angle of elevation to be 50 degrees. How far apart are ...
Sunday, November 6, 2016 by Anonymous

Trig
find all solutions of 2sinx=1-2cosx in the interval from 0 to 360
Tuesday, November 1, 2016 by Anonymous

Pre-Calc/ Trig
Find the sum of the three smallest positive values of theta such that 4(cos^2)(2theta-pi) =3. (Give your answer in radians.) LaTEX: Find the sum of the three smallest positive values of $\theta$ such that $4\cos^2(2\theta-\pi) =3$. (Give your answer in radians.)
Monday, October 31, 2016 by Steve Ho

Physics algebra and trig
A pair of fuzzy dice is hanging from the rearview mirror of a race car. As the car accelerates smoothly, the strings of the dice are tilted slightly toward the rear of the car. From the perspective of the driver, which one of the following statements is true, if the dice are ...
Thursday, October 20, 2016 by Kyle

Trig
Write 3theta - sin 4theta as a product.
Monday, October 17, 2016 by Sade

Trig
Use the half-angle formula to simplify (sin4theta)/(1+cos4theta)
Monday, October 17, 2016 by Sade

math trig
how do you solve arcsin(3/5) without a calculator?
Sunday, October 16, 2016 by help

Trig
If angle A is 45 degrees and angle B is 60 degrees. Find sin(A)cos(B), find cos(A)sin(B), find sin(A)sin(B), and find cos(A)cos(B) The choises for the first are: A. 1/2[sin(105)+sin(345)] B. 1/2[sin(105)-sin(345)] C. 1/2[sin(345)+cos(105)] D. 1/2[sin(345)-cos(105)] You don't ...
Saturday, October 8, 2016 by Sade

Trig
Given tan(A) = 2 and A is in Quadrant I, find tan(2A). A. -1/3 B. 2/3 C. -4/3 D. -2/3
Friday, October 7, 2016 by Sade

Trig
Given tan(A) = 2 and A is in Quadrant I, find cos(2A). A. 0 B. 1 C. 1/2 D. -3/5
Friday, October 7, 2016 by Iris

Trig
Just confused. Given tan(A) = 2 and A is in Quadrant I, find sin(2A). A. 0 B. 1 C. 1/2 D. 4/5
Friday, October 7, 2016 by Iris

Trig
Given Tan(A) = 5 in Quadrant III and Sin(B) = ⅔ in Quadrant II, what is the Quadrant of A-B?
Thursday, October 6, 2016 by Sade

Trig
Given Tan(A) = 5 in Quadrant III and Sin(B) = ⅔ in Quadrant II, find Cos(A-B).
Thursday, October 6, 2016 by Sade

Trig
Given Tan(A) = 5 in Quadrant III and Sin(B) = ⅔ in Quadrant II, find Sin(A-B).
Thursday, October 6, 2016 by Sade

Math (Trig Review)
Evaluate the expression without using a calculator (Make a sketch of a right triangle) tan(arccot 2) Thanks in advance! I'm trying to refresh my memory of these kinds of problems and I'm having trouble on how to solve this problem
Friday, September 30, 2016 by Ray

Trig
Cosine theta=8/17 and 270 degrees is < theta, and theta is< 360
Wednesday, September 28, 2016 by Sarah

math trig
A Ferris wheel with a diameter of 37 meters rotates at a rate of 4 minutes per revolution. Riders board the Ferris wheel 4 meters above the ground at the bottom of the wheel. A couple boards the Ferris wheel and the ride starts. Write a formula for the height of the couple t ...
Wednesday, September 28, 2016 by help

maths trig need help
show that sinx/(1-cotx)+cosx/(1-sinx)=sinx+cosx thanks
Tuesday, September 27, 2016 by rap

maths trig
A flag in the form of an equilateral triangle is connected to the tops of 2 vertical poles. One of the pole has a length of 4 and the other pole has a length of 3. You also know that the third vertex touches the ground perfectly. Calculate the length of a side
Friday, September 23, 2016 by samson

Trig
Can someone check my answers? Find # of triangles possible: <A=44.3, a=11.5, b=7.7 ... 2 triangles, B=~27.9 or B=~152.1 <A=29.3, b=20.5, a=12.8 ... 2 triangles, B=~51.6 or B=~128.4
Wednesday, September 21, 2016 by K

Trig
A ship leaves port and sails at a bearing of 124degrees. Another ship leaves the same port, at the same time, sailing at a bearing of 74degrees. When both ships are 80 miles from the port, how far are they from each other?
Sunday, September 11, 2016 by Adrienne

Trig
1. Given Sin(A) = ⅗ and Cos(B) = 8/17 in Quadrant I, find Sin(A+B). a) 24/80 [b)] 84/85 c) 60/80 d) 60/85 Find Cos(A+B). a) 32/80 b) -45/85 c) -13/80 [d)] -13/85 Find Tan(A+B) a) 0.8 [b)] -1.72 c) -4.21 d) -6.46 I keep getting an 1.61 answer but that isn't an option? ...
Tuesday, September 6, 2016 by Lyss

Algebralgebrad
Trig ientities
Sunday, September 4, 2016 by yaga

Trig
if sin(x)=-0.5 and x is in the third quadrant, find x
Saturday, August 20, 2016 by Jason

trig
if sec theta =sqrt -20/3 state the exact value of tan theta
Tuesday, July 26, 2016 by Anonymous

MAth Trig
Find the diameter of a circle with an arc length of 32 cm and a subtended angle of 72 degrees
Tuesday, July 26, 2016 by Anonymous

MATH
Solve the integral using trig substitution (1/((x)(x^2+1)))dx
Sunday, July 24, 2016 by ANON

MATH
Integrate 1/(x(x^2+1)) dx using trig substitution
Sunday, July 24, 2016 by ANON

Math - Trig
The depth of water, h, in metres at time t, in hours, is given by the formula: h(t)=7.8+3.5sin[pi/6(t−3)]. Its a 24 hours period and t=0 is midnight. Provide an algebraic solution to determine the time(s) of day, the water reaches the depth of 10.29 m i got one time 4.51...
Friday, July 22, 2016 by Sherry

Math - Trig
The equation given below models the average monthly temperature (˚C). t denotes the number of months with t=1 representing January. During which months is the average monthly temperature 12.5˚C? 𝑇(𝑡) = 12.5 + 15.8sin (𝜋/6 (𝑡) −2...
Wednesday, July 20, 2016 by Anonymous

Math - Trig
A hamster enters a wheel at the lowest point and begins to run . The height of point R (in the diagram below) above the ground is given by the function ℎ(𝑡) = −17.5 cos ( 2pi/3 𝑡) + 19, where ℎ is height in centimeters and 𝑡 is time in...
Wednesday, July 20, 2016 by Anonymous

Math - Trig
Solve for exact or to 1d.p of x E [0 ,2pi] 4cos^2x-3
Monday, July 18, 2016 by Anonymous

Pre-Cal
[Note: I'm still having issues with identities with regard to trig] Verify the Trig. identities: (a). cot(x+y)=(cotxcoty-1)/(cotx+coty) (b). sin0(cot0+tan0)=sec0 [Note: 0=theta symbol]
Monday, July 11, 2016 by Amber

trig
what is the exact value of tan 105 degrees
Wednesday, June 29, 2016 by fortue

trig
If a ship leaves port at 9:00 a.m. and sails due south for 3 hours at 14 knots, then turns N 60° E for another 2 hours, how far from port is the ship?
Friday, June 24, 2016 by need help

trig
If a ship leaves port at 9:00 a.m. and sails due north for 3 hours at 12 knots, then turns N 30° E for another hour, how far from port is the ship?
Wednesday, June 22, 2016 by lejla

Math (Trig)
Suppose the point A is on a circle of radius 6 with an angle of 240 degrees. Find the value of the coordinates of this point. Round your results to 3 decimal places. So in this case, x=rcos(theta) y=rsin(theta) x=6cos(240) y=6sin(240) Rounding to 3 decimal places: x=-3 y=-5....
Tuesday, June 7, 2016 by Giovanni

Math (Right Triangle Trig)
Suppose tan(theta)=5/7 and theta belongs to Quadrant III, find the exact value of sec(theta)? I already took the steps to solve this problem but I am confused if whether or not sec(theta)is positive or negative sqrt(74)/7 Any help is greatly appreciated!
Sunday, June 5, 2016 by Giovanni

Trig
6. To win a javelin throwing competition, your last throw must travel a horizontal distance of at least 100 feet. You release the javelin at a 40° angle with an initial speed of 71 feet per second. Do you win the competition? Justify your answer
Friday, June 3, 2016 by Noah Ahmed

Math trig
Hello guys. I am just wondering if tan^2 A (tan squared A) = sin^2 A /cos^2A And 2tan A = 2sin A / 2cos A This has been bothering me when I have to simplify trig. Thanks in advance.
Wednesday, June 1, 2016 by Jack

Trig
If sin(theta) = 3/7, what is sin (pi/2 - theta)?
Thursday, May 19, 2016 by Anonymous

Math (Trig)
Convert the Cartesian coordinate (-1,2) to polar coordinates, 0≤θ<2π I know r is sqrt(5) but how would I find theta between 0 and 2pi? Thanks in advance!
Monday, May 16, 2016 by Giovanni

Math (Trig)
A clock tower has been constructed such that the center of the clock is 40 feet above ground. The minute hand on the clock is 3 feet long. How far above the ground the end of the minute hand at 12:05? 1:00?
Friday, May 13, 2016 by Bree

geometry and trig
If a cylinder with a 4 inch diameter and a 6 inch height holds 1 pound of oatmeal. How much oatmeal will a cylinder (similar) with a 10 inch diameter hold? Volume of 4 in-----24pi volume of 10 in----137pi I get 91 oz choiced are37,44,74, 192
Tuesday, May 10, 2016 by lulu

Math (Trig) lowering powers
If cos^4(3x)-sin^4(3x)=cos(g(x)) then g(x)=? Use a^4-b^4=(a^2-b^2)(a^2+b^2)! thanks in advance for any help!
Monday, May 9, 2016 by Giovanni

trig
sec = 7/2 and is in Q1, then what is double angle of tan?
Saturday, May 7, 2016 by PLEASE HELP ME

Trig
Two rays with common endpoint O form a 30 degree angle. Point A lies on one ray, point B on the other ray, and AB=1. What is the maximum possible length of OB?
Saturday, May 7, 2016 by Pip

Pre-Cal (Trig) Help?
The following relationship is known to be true for two angles A and B: cos(A)cos(B)-sin(A)sin(B)=0.957269 Express A in terms of the angle B. Work in degrees and report numeric values accurate to 2 decimal places. So I'm pretty lost on how to even begin this problem. I do know ...
Friday, May 6, 2016 by Giovanni

trig, precalc, math, algebra, trigonometry
Rewrite: tan(cos^−1 (v)) as an algebraic expression in v. Please help me understand.
Thursday, May 5, 2016 by Veronica

trig
sin 25° cos 35° + cos 25° sin 35°
Wednesday, May 4, 2016 by EBB

Trig
find the equation for the cosine function that has an amplitude of 3/5, a period of 3pi/2 and a y-intercept of 5.
Tuesday, May 3, 2016 by Jon

Math -Trig
Determine the exact value if cot(3pi/4) using special triangles. I don't understand how it could be 1/tan3pi/4 in a triangle....
Tuesday, May 3, 2016 by Jen

Math - Trig
if the diameter of a tire is 3.5 m and makes one rotation every 5 seconds, how far does the tire rotates in one minute?
Tuesday, May 3, 2016 by Jen

Geometry/Trig
In triangle ABC, A is a right angle, and m b=45 degrees. What is the length of BC? If your answer is not an integer, leave it in simplest radical form. a. 16 ft b. 16 sq 2 ft c. 16 sq 3 ft d. 32 ft I'm really confused as to how to do this... Could someone please explain and ...
Tuesday, May 3, 2016 by Gina

trig
tan(theta)/tan(2theta)-tan(theta)= cos(2theta)
Sunday, May 1, 2016 by aaron

Trig
Problem: A cable from the top of a 60 foot high tower is to be attached to the ground (x) feet from the base of the tower. A) if the cable makes an angle of t radians with the ground when attached, express t as a function of x. B) if t = pi/5, how far is the end of the cable ...
Sunday, May 1, 2016 by Chris

Trig
Solve each equation for exact solutions over the interval [0,360)where appropriate. Round approximate solutions to the nearest tenth degree. Sin^2Theta=Cos^2Theta+1 My Work: Using double angle Identity I subtract 1 to other side therefore: 1-Sin^2theta=Cos^2theta= Cos2theta=...
Wednesday, April 27, 2016 by Ronald

Trig
While fishing on a lake, the fisherman looks up at a cliff. His boat is 23 ft from the base of the cliff, and the angle of elevation is 40 degrees. Find the height of the cliff to the nearest tenth of a foot.
Wednesday, April 27, 2016 by Tg

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