Tuesday
December 6, 2016

Homework Help: Math: Trigonometry

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. d) ...
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'...
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

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?

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 ...
Friday, May 6, 2016 by Giovanni

trig, precalc, math, algebra, trigonometry
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 ...
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

trig
A car is traveling at 34 miles per hour. If its tires have a diameter of 14 inches, how fast are the car’s tires turning? Express the answer in revolutions per minute and round to two decimal places.
Tuesday, April 26, 2016 by EBB

trig
A car is traveling at 34 miles per hour. If its tires have a diameter of 14 inches, how fast are the car’s tires turning? Express the answer in revolutions per minute and round to two decimal places.
Tuesday, April 26, 2016 by EBB

Trig
Days 0 2 4 6 8 10 12 14 16 Lions (number) 1272 1523 1152 891 1284 1543 1128 917 1185 Deer (number) 39 47 63 54 37 48 60 46 40 Find a sin Equation for Lions and deer. use this model. Thanks! y=k + A sin (Bx+C)
Monday, April 25, 2016 by Joshaw

trig
Solve triangle ABC. (If an answer does not exist, enter DNE. Round your answers to one decimal place.) a = 63, c = 50, ∠C = 53°
Tuesday, April 19, 2016 by jorge

Math-Trig
Answer to four significant figures, or to the nearest minute. f) one vertex angle of a rhombus is 25°. Find the ratio of the diagonals.
Monday, April 18, 2016 by Jessica

Trig
A small plane takes off from island A and flies in a straight line for 12 kilometers. At the same time, a sailor sitting in a sailboat who is 5 miles from the island measures the angled by from island A to the sailboat and the plane is 37 degrees. How far is the plane from ...

Trig
A Flagpole casts a 60 foot long shadow on the ground. The angle from the tip of the flagpole to the end of the flagpole's shadow measures 35 degrees. How tall is the flagpole? can i use tan(35degrees) = 60/h which gives me 85.714. Please check. Thanks!
Monday, April 18, 2016 by Steve please check

A Flagpole casts a 60 foot long shadow on the ground. The angle from the tip of the flagpole to the end of the flagpole's shadow measures 35 degrees. How tall is the flagpole? can i use cos(55degrees) = 60/h which gives me 104.61. Please check. Thanks!
Monday, April 18, 2016 by Check

Trig
A Flagpole casts a 60 foot long shadow on the ground. The angle from the tip of the flagpole to the end of the flagpole's shadow measures 35 degrees. How tall is the flagpole? Draw a picture and label. Thank you.
Monday, April 18, 2016 by Ram

Math Trig
use a double-angle formula to find the exact value of cos2u when sinu=5/13 , where pi/2<u<pi So far I went cos2u=1-sin^2 =1-2(25/169) =1-(50/169)
Thursday, April 14, 2016 by Larry

Trig
If the terminal side of an angle theta contains the point (-1,3), find secant theta.
Wednesday, April 13, 2016 by Maxine

Trig
Find sin(x+y), cos(x-y), tan(x+y), and the quadrant of (x+y) if sinx= -1/4, cosy= -4/5, with x and y in quadrant 3.
Sunday, April 10, 2016 by Brendan

trig
The minute hand of a clock is 7 inches long and moves from 12 to 11 ​o'clock. How far does the tip of the minute hand​ move? Express your answer in terms of pi and then round to two decimal places.
Friday, April 8, 2016 by sareen

Trig
Find the length of a chord intercepted by a central angle of 25 degrees in a circle of radius 30 feet
Wednesday, April 6, 2016 by Anonymous

trig
2(sinx)^2-5cosx-4=0 Solve for all solutions between [0,2pi]
Tuesday, April 5, 2016 by Anonymous

Trig
suppose that the angle theta is in the second quadrant, and that sin(theta)=1/3. Find exact values for cos (theta) and csc (theta)
Tuesday, April 5, 2016 by alicia otto

Solve cos315*cos(-390)-sin225*sin750 cos315: <RA = 360-315 = 45 cos45 = 1/√2 cos-390: <RA=-390+360 =30 cos30= √3/2 sin225: <RA = 225-180 = 45 Sin45=1/√2 Sin750: <RA = 750 - 2(360) =30 Sin30=1/2 Put it all together... (1/√2)(√3/2)-(1/&#...
Tuesday, April 5, 2016 by AmbiguousCase

Trig
How do I write cos(11x)cos(x)+sin(11x)sin(x) as a single trigonometric function? Please show steps.
Sunday, April 3, 2016 by Anonymous

trig
Angle θ lies in the second quadrant, and sin θ = 3/5. Find cos θ and tan θ.
Friday, April 1, 2016 by Britt

Trig
Find the exact values of sec(x)=7. I know that cos(x)=1/7. I know that sin(x)= sqrt(1-91/4900). I know that tan(x)=1. I know how to do the problem but I'm not really sure why, and I'd like to know. I got 4sqrt(3). Please help!
Friday, April 1, 2016 by Emily

trig
Which expression is equivalent to tan(-x)cos^2x? -sin xcos x sin xcos x tan x + sin2x tan x − sin2x -tan x − sin2x
Thursday, March 31, 2016 by jimmy

Trig
If tan A= 3/4 and cos B=-5/13, where A and B are both third-quadrant angles, find sin(A+B). Please explain how you found all the answers
Thursday, March 31, 2016 by Lexi

geometry and trig
I have a regular octagon with a radius of 9. I have split the 8 pie slices into right angles--leaving angles 90, 67.5, and 22.5. I looked for the sine of 22.5 opp/hyp and get .38. Then the oppositeside is 6.84. I can't get the right answer, what am I doing wrong? Thanks
Wednesday, March 30, 2016 by lulu

Trig Help
Given the equation for simple harmonic method d=1.3cos(3pi/4 t) answer the following questions: a)Find the maximum displacement. 1.i got 1.3 b)Find the frequency and length of the pendulum c)Calculate the value of d when t=3 i got .919 d)Determine the least positive value of t...
Thursday, March 24, 2016 by Ryan

Trig
Find the algebraic expression that is equal to sec theta - cos (-theta)
Thursday, March 24, 2016 by Amanda

Trig
find the algebraic expression that is equal to sin (-theta) sec(-theta) cot(-theta)
Thursday, March 24, 2016 by Amanda

trig
Simplify and write the trigonometric expression in terms of sine and cosine: cot(-x)cos(-x)+sin(-x)=-1/f(x)=f(x)=____​________ I've tried everything, I think that the "-1/f(x)" part is screwing up my answer but I'm not sure what it's asking me to do...
Wednesday, March 23, 2016 by mv

trig
a building 60 feet high. from a distance at point A on the ground, the angle of elevation to the top of the building is 40 degree. from a little nearer at point B, the angle of elevation to the top of the building is 70 degree. What's the distance between point A and B ?
Friday, March 18, 2016 by Anonymous

Trig identity.
I need help with verifying these trig identities: 1) sin4x = 4sinxcos - 8sin^3 x cos x 2) cos3x = cos^3 x - 3sin^2 x cos x
Tuesday, March 15, 2016 by Jane

Trig help
Can someone help me find ALL solutions in the interval [0,2π) for the given equations. Please show work. 1) sin2x = sin2x 2) tan2x +tanx = 0
Tuesday, March 15, 2016 by Jane

Trig
I have a diagram of how far a discus was thrown. From A to B is 100m, C is perpendicular to A, from A to C is 50m, A and B are connected to D (it should be a triangle), A has a 40° angle and B has a 75° angle. C is not perpendicular to D btw.. a. Find AD and use it to ...
Sunday, March 13, 2016 by Anonymous

Trig
The original screamer radius =100 feet rotated 1 deg per sec. The engg decided to make it scarier by making it rotate 18 deg per second. Write the new equation for the vertical position of a passenger on the screamer where the domain is now the time per revolution (in sec)
Thursday, March 10, 2016 by skk

Trig - Ambiguous Cases
Triangle HAV has <H = 124, a=8.5mm, and h=7.2mm How many solutions are there? What I attempted: SinH/h=SinA/a Sin124/7.2=SinA/8.5 SinA=8.5(Sin124/7.2) <A = 78.2 RULE => All interior angles must add up to 180 degrees therefore this triangle has 0 solutions. The ...
Wednesday, March 9, 2016 by AlphaPrimes

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