# Homework Help: Math: Trigonometry

## Recent Homework Questions About Trigonometry

**trig**

AB = 8 cm, AC = 6 cm, AD = 7 cm, CD = 2.82 and CAB=50° (a) the length BC (b) The size of angle ABC; (c) The size of angle CAD (d) The area of triangle ACD

*Sunday, May 27, 2012 by anonymous*

**trig**

An electric pole is supported to stand vertically on a level ground by a tight wire. The wire is pegged at a distance of 6 meters from the foot of the pole. The angle that the wire makes the ground is three times the angle it makes with the pole.

*Sunday, May 27, 2012 by anonymous*

**trig**

plot of land ABCD such that AB = 85m, BC = 75m, CD = 60m, DA = 50m and angle ACB = . Determine the area of the plot in hectares correct to two decimal places

*Sunday, May 27, 2012 by anonymous*

**algebra 2/trig**

x+5 1 ------- - 1= ------- x^2-2x x^2-2x

*Sunday, May 27, 2012 by Anonymous*

**Calc- Trig Substitution**

integral of dx/square root(x^2-64) My answer is: ln (x/8 + square root(x^2-64)/8) +c is this right?

*Friday, May 25, 2012 by kelly*

**trig**

Solve cos x-1 = sin^2 x Find all solutions on the interval [0,2pi) a. x=pi, x=pi/2, x= 2pi/3 b. x=3pi/7, x=pi/2, x=2pi/3 c. x=3pi/7, x=3pi/2, x=3pi/2 d. x=pi, x=pi/2, x=3pi/2

*Wednesday, May 23, 2012 by Anonymous*

**trig**

evaluate the expression tan (257pi/4) a.-1 b. -(sqrt2)/2 c. 1 d. (sqrt2)/2

*Wednesday, May 23, 2012 by Anonymous*

**trig**

A tree casts a shadow of 27 meters when the angle of elevation of the sun is 26 degrees. Find the height of the tree to the nearest meter. a. 24 m b. 15 m c. 320 m d. 13 m

*Wednesday, May 23, 2012 by Anonymous*

**trig**

a voltmeter's pointer is 3 cm in length. find the degrees through which is rotates when it moves 1.1 cm on the scale?

*Wednesday, May 23, 2012 by aubrey*

**trig**

6. Compute the modulus and argument of each complex number. I did a-c and f. D. -5 E. -5+5i G. -3-4i 7. Let z= -5sqrt3/2+5/2i and w= 1+sqrt3i a. convert z and w to polar form b. calculate zw using De Moivres Theorem c. calculate (z/w) using De M's theorem Please help with ...

*Wednesday, May 23, 2012 by BreAnne*

**trig**

Find all solutions of cos 2x + √2/2 =0. a) + or - 3/8pi +Kpi b) 2/3pi + Kpi, 5/3pi + Kpi c) + or - 2/5 +Kpi d) 2/3 pi + 2Kpi, 5/3pi + 2Kpi I really need help on this question :(

*Tuesday, May 22, 2012 by Anonymous*

**Trig**

what are the rectangular coordinates of (-2(pi/6))? please help.

*Tuesday, May 22, 2012 by BreAnne*

**math trig**

ln(2x-5)= 4 how do i this problem? thanks!

*Monday, May 21, 2012 by greeny*

**TRIG**

I need to state the period and 2 consecutive asymptotes on the graph for the following questions. 1: y = -3 tan pi*x period: pi (?) asymptotes: ? 2: y = 2 sec 4x period: ? asymptotes: ? 3: y = csc (x/3) period: ? asymptotes: ? 4: y = 3 cot (pi*x/2) period: ? asymptotes: ?

*Monday, May 21, 2012 by Laura*

**graphing trig functions**

given y=(3x+2pi) how would i graph one period this without a calculator? amplitude:1 period: 2pi/b = 2pi/3 is this correct? what is the minimum and maximum points?

*Sunday, May 20, 2012 by bkue*

**trig**

how can you find points of a tri equation at orgin 1/4, 1/2, 3/4, and end of the period

*Sunday, May 20, 2012 by keira*

**Trig**

Find two values of theta that satisfy the equation. give your answers in degrees (0degrees <theta<360degrees ) and radians (0<theta<2pi) a. sin θ= sqrrt3/2 b.sin θ= - sqrrt3/2

*Saturday, May 19, 2012 by Sue*

**Trig**

Find the radian measure of the central angle of a circle of radius r that intercepts an arc of length s.? Radius, r=16 ft Arc length, s=10 ft

*Friday, May 18, 2012 by Sue*

**graphing trig functions**

for graphing basic trig functions such as y=2sinx or y=1/3cosx, how do you know what the points are to graph with out using a calculator?

*Friday, May 18, 2012 by bkue*

**trig**

write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x

*Thursday, May 17, 2012 by kate*

**trig**

write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x

*Thursday, May 17, 2012 by jake*

**trig**

find the angle between vector U=<2,3> and V=<1,-5> answers: 88 degrees, 45 degrees, 135 degrees, or 92 degrees...?

*Thursday, May 17, 2012 by jake*

**trig function**

Suppose f(x)=cos x - sin x and g(x)=cos x + sin x. Explain why the graph of (fxg)(x) is equivalent to the graph of h(x)=cos x after it has been horizontally compressed by a factor of 1/2. Please help, thank you!

*Thursday, May 17, 2012 by Kjd*

**trig**

write y=sinx-cosx in the form y=ksin (x+a), where the measure of a is in radians. answers: sqrt2sin (x+3pi/4), sqrt2sin (x+5pi/4), sqrt2sin (x+pi/4), or sqrt2sin (x+7pi/4) ...?

*Thursday, May 17, 2012 by Kalen*

**trig**

write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x

*Thursday, May 17, 2012 by Kalen*

**trig**

Write an equation for simple harmonic motion, given that the amplitude equals 4 inches and the period equals 2 seconds and the max displacement occurs when t=0. answers: y=4sin pi t, y=4cos pi t, y=4cos t, y=4sin2 pi t

*Thursday, May 17, 2012 by Kayla*

**trig**

an angle with the radian measure of 9pi/5. find radian measure of its reference angle. answers: -4/5, 4pi/5, -pi/5, or pi/5

*Thursday, May 17, 2012 by Kayla*

**trig**

what is the exact value of sin[tan^-1(2/3)]

*Thursday, May 17, 2012 by Kayla*

**trig**

U=5i+11j and V=2i-3j, find 2U-7U

*Thursday, May 17, 2012 by ky*

**trig**

write 2+2 squareroot of 3i in trig form.

*Thursday, May 17, 2012 by ky*

**trig**

find the angle between vectors U= <2,3> and V= <1, -5>

*Thursday, May 17, 2012 by TAYLOR*

**trig**

a vector has a magnitude of 16 and direction of 120 degrees. write the vector in terms of unit vecotrs i and j.

*Thursday, May 17, 2012 by TAYLOR*

**trig**

what is the magnitude and direction of the vector U= -2i - 3j

*Thursday, May 17, 2012 by TAYLOR*

**trig**

write y=sinx-cosx in the form y=ksin (x+a), where the measure of a is in radians.

*Thursday, May 17, 2012 by Calvin*

**trig**

solve 2cos^2x-sinx=1, 0 < or equal to x < 2pie

*Thursday, May 17, 2012 by Calvin*

**trig**

write sin4xcos2 as the sum or difference of two functions.

*Thursday, May 17, 2012 by Calvin*

**trig**

what's the single trig. function of cos6xcosx-sin6xsinx

*Thursday, May 17, 2012 by MIK*

**trig**

Given sin a = 15/17 with a in Quadrant I and cos beta = 4/5 with beta in QuandrantIV, find the exact value of cos(a+beta)

*Thursday, May 17, 2012 by MIK*

**trig function**

Suppose f(x)=cos x - sin x and g(x)=cos x + sin x. Explain why the graph of (fxg)(x) is equivalent to the graph of h(x)=cos x after it has been horizontally compressed by a factor of 1/2. Thanks so much...

*Thursday, May 17, 2012 by Anonymous*

**trig function**

Suppose f(x)=cos x - sin x and g(x)=cos x + sin x. Explain why the graph of (fxg)(x) is equivalent to the graph of h(x)=cos x after it has been horizontally compressed by a factor of 1/2. Thanks so much...

*Thursday, May 17, 2012 by Anonymous*

**trig function**

Suppose f(x)=cos x - sin x and g(x)=cos x + sin x. Explain why the graph of (fxg)(x) is equivalent to the graph of h(x)=cos x after it has been horizontally compressed by a factor of 1/2. Thanks so much...

*Thursday, May 17, 2012 by Anonymous*

**trig**

what is the amplitude, phase shift, and period of -3sin(2t- pie/3)

*Wednesday, May 16, 2012 by MIK*

**trig**

on a triangle, A = 50 degrees, B = 81 degrees, and c = 12. what does a, b, and C equal?

*Wednesday, May 16, 2012 by MIK*

**trig**

inverse tan x = inverse cos 4/5

*Wednesday, May 16, 2012 by makaela*

**trig**

A wheel rotates at 100 revolutions per second. find the angle velocity in radians per second.

*Wednesday, May 16, 2012 by makaela*

**trig**

find the single term of cos^2 4theta - sin^2 4theta

*Wednesday, May 16, 2012 by jenna*

**trig**

find the period of f(x)=-2cot x/5

*Wednesday, May 16, 2012 by jenna*

**trig**

what is the single term of csc^2 theta-1 over csc^2 theta

*Wednesday, May 16, 2012 by taylor*

**trig**

what is the angle of A? C = 125 degrees, a = 18, and c = 42

*Wednesday, May 16, 2012 by taylor*

**trig**

find the supplimentary angle of pie over 8

*Wednesday, May 16, 2012 by taylor*

**trig**

find the exact radian of 84 degrees

*Wednesday, May 16, 2012 by taylor*

**trig**

Find the amplitude of f(t)=1/3sin8t

*Wednesday, May 16, 2012 by taylor*

**Trig**

Find the eccentricity of the ellipse. x^2+7y^2=35

*Wednesday, May 16, 2012 by Sarah*

**trig and combine function**

Suppose f(x)=cos x - sin x and g(x)=cos x + sin x. Explain why the graph of (fxg)(x) is equivalent to the graph of h(x)=cos x after it has been horizontally compressed by a factor of 1/2. Thanks so much...

*Wednesday, May 16, 2012 by thomas*

**trig**

3e^2x=18

*Wednesday, May 16, 2012 by dirty pete*

**trig**

solve for the equation x sin x= -.35 180<x<270 sin x= .2 90<x<180 cos x = -.72 180< x<270 please explain, thanks :)

*Tuesday, May 15, 2012 by bkue*

**Trig**

Ok i understand how to do these I'm just stuck on this one: secx + tanx = 1

*Tuesday, May 15, 2012 by Anonymous*

**trig**

2sin(4x)[(cos(3/2)x)(cos(5x/2)-sin((15/4)x)]+x can someone simplify this using trig identities?

*Sunday, May 13, 2012 by Brianna*

**trig! please help!**

2sin(4t)[(cos(3/2)x)(cos(5x/2)-sin((15/4)x)]+x

*Sunday, May 13, 2012 by Brianna*

**trig pre calc**

cos x (sec x +cos x csc2x)=csc2x

*Sunday, May 13, 2012 by trig identities*

**trig**

find the values of x between 0 and 2 pi where the tangent line to the graph of y = sinxcosx is horizontal

*Sunday, May 13, 2012 by Jom*

**trig**

cos(π-x)=

*Friday, May 11, 2012 by Anonymous*

**trig**

1-2sin^2(2x)

*Thursday, May 10, 2012 by Anonymous*

**trig**

two dice are rolled, find p(2,then 3)

*Thursday, May 10, 2012 by Lashae*

**Trig**

simplify the expression to a single term: (1-2Sin^2 X)^2 + 4sin^2 X Cos^2 X I'm not sure how to start this or which identities to use. Any suggestions?

*Monday, May 7, 2012 by Anonymous*

**Trig**

If you are dealt 3 cards from a shuffled deck of 52 cards, find the probability that all 3 cards are picture cards.

*Monday, May 7, 2012 by Katie*

**algebra-trig help asap**

Write an equation I'm not sure how to do this though. The sine of x with an amplitude of 4, period of 3(pie) and phase shift to the right of pie/4

*Saturday, May 5, 2012 by missy*

**math algebra trig**

For the graph of each function, find an equation of the line of symmetry and the coordinates of the vertex. Tell whether the value of the function at the vertex if a maximum or a minimum: a) y = -x^2 + 4x - 7; b) y = 2x^2 + 4x; c) y = -3x^2 - 18x + 5.

*Saturday, May 5, 2012 by CHEYANNE MARIE*

**algebra-trig help asap**

An isosceles triangle has a base 36 cm long and a base of 65 degrees. Find its perimeter. I'm not sure if this is right but my answer is 1250.4 in^2

*Saturday, May 5, 2012 by missy*

**PreCalculus (PLEASE HELP, IM BEGGING!)**

Can anyone please explain these problems to me?? I really need help!I need to simplify these trig expressions but I don't understand how my teacher is doing it at all and I have a quiz on this tomorrow! I've really been trying but I just don't get it! 1)Mulitply: [cosx/(1-cosx...

*Saturday, May 5, 2012 by Valerie*

**trig**

If x and y are complementary angles and 5 tan x-12=0,calculate by using a diagram the value of 2sin(squared)x+cos y.

*Thursday, May 3, 2012 by Francis*

**trig**

What is the exact value of 11pi/8? (with steps please) :)

*Monday, April 30, 2012 by Anonymous*

**trig**

Determine whether the vectors are parallel, perpendicular or neither. 1) v = (4,1), w = (1,-4) 2) v = (2,3), w = (4,6) 3) v = (2,3), w = (3,-3) Please and thanks!

*Monday, April 30, 2012 by Sam*

**trig**

Find the component form for vector v with the given amplitude and direction angle theta. |v|=20.6, theta=102.5deg

*Monday, April 30, 2012 by Sam*

**trig**

(-10√2, -10√2), find te magnitude and direction angle of the vector, measure the direction angle in [0, 360). Please help!

*Monday, April 30, 2012 by Savannah*

**trig**

Find the dot product of u and v u= 3i+7j v= 11i-5j

*Monday, April 30, 2012 by Sam*

**Application prob. for Trig.**

Hi, A fountain in a shopping centre has a single jet of water. The height of the jet of water varies according to a sinusoidal function. A student notes that, in exactly one minute, the jet goes from a minimum height of 2m to a maximum height of 6m and back to 2m. At 13:00, ...

*Monday, April 30, 2012 by Anonymous*

**trig**

At rest, the human heart beats once every second. At the strongest part of the beat, a person's blood pressure peaks at 120mmHg. At the most relaxed part of the beat, a person's blood pressure drops to 80mmHg. Supposing that t = 0 corresponds to the peak of the beat, write ...

*Monday, April 30, 2012 by Dave*

**trig**

a 6 foot tall man is standing near a tree on level ground .if the man shadow 4 feet long .how many feet tall is the tree?

*Sunday, April 29, 2012 by diamond*

**Honors Trig.**

A plane is flying at a speed and direction of 550 mph, 25 degrees north of west. There is a wind of 28 mph, at an angle of 19 degrees south of the east direction. How fast is the plane actually flying? What direction is the plane traveling?

*Sunday, April 29, 2012 by Ashley*

**Maths trig**

Use compound angle formulae to express Second harmonic i2= sin2t and the the third harmonic i3=sin3t in terms of the first harmonic sint

*Sunday, April 29, 2012 by Stephan pultree*

**algebra 2/trig**

Write the next term of sequence,and then write the rule for the nth term. 1)1,8,27,64,....125 the nth is 2) 3,8,15, 24,.....35 the nth is Can you help me and correct ? thank

*Saturday, April 28, 2012 by JOSEPH*

**TRIG**

5. A wheel 5.00 ft in diameter rolls up a 15.0° incline. How far above the base of the incline is the top of the wheel after the wheel has completed one revolution? A. 4.07 ft B. 13.1 ft C. 8.13 ft D. 9.07 ft

*Saturday, April 28, 2012 by PAM*

**algebra2/trig**

Write the next term of sequence,and then write the rule for the nth term. 1)1,8,27,64,....125 the nth is n 2) 3,8,15, 24,.....35 the nth is Can you help me and correct ? thank you

*Saturday, April 28, 2012 by JOSEPH*

**trig question**

Hi, my question is attached to the web below (picture), because I can't draw the diagram on here. Sorry for any inconvenience. Please help and thanks. imageshack . us/photo/my-images / 845 / img0043gx . jpg/

*Saturday, April 28, 2012 by Anonymous*

**trig-math**

4. A carpenter wants to be sure that the corner of a building is square and measures 6.0 ft and 8.0 ft along the sides. How long should the diagonal be? A. 12 ft B. 10 ft C. 11 ft D. 14 ft 5. A wheel 5.00 ft in diameter rolls up a 15.0° incline. How far above the base of the ...

*Saturday, April 28, 2012 by LOVE*

**trig question**

NEW DIAGRAM: On a unit circle, sin x = square root 3 over 2, with center O. Vertical line from top to center of circle is PO. Horizontal line from middle to right of circle is OE. Another vertical line of AB is parallel to PO. And radius of circle (line from O to A) is 1 unit...

*Saturday, April 28, 2012 by Anonymous*

**trig question**

On a unit circle, sin x = square root 3 over 2, with center O. Vertical line from top to center of circle is PO. Horizontal line from middle to right of circle is OE. Another vertical line of AB is parallel to PO. And radius of circle (line from O to A) is 1 unit. From A to E ...

*Saturday, April 28, 2012 by Anonymous*

**math-TRIG**

1. Which angle measure is consistent with all of the following criteria? (i) The reference angle is 40°. (ii) The angle is more than one revolution. (iii) The angle's terminal side is in Quadrant II. (iv) The angle isn't positive. A. –580° B. –500° C. –220° D. 500° ...

*Saturday, April 28, 2012 by LOVE*

**trig problem**

Hi, A fountain in a shopping centre has a single jet of water. The height of the jet of water varies according to a sinusoidal function. A student notes that, in exactly one minute, the jet goes from a minimum height of 2m to a maximum height of 6m and back to 2m. At 13:00, ...

*Saturday, April 28, 2012 by Anonymous*

**Trig. application**

Hello.. In your previous solution to the question: "Dave is going for a ride on his unicycle. The radius of the wheel is 25.5cm. When he gets on, the valve of the wheel is at its maximum height. He pedals along a path at a speed of 30km/h. At what height will the valve be ...

*Saturday, April 28, 2012 by Anonymous*

**math - trig**

1.Which angle measure is consistent with all of the following criteria? (i) The reference angle is 40°. (ii) The angle is more than one revolution. (iii) The angle's terminal side is in Quadrant II. (iv) The angle isn't positive. A. –580° B. –500° C. –220° D. 500° 2...

*Saturday, April 28, 2012 by Anonymous*

**Trig. application**

Dave is going for a ride on his unicycle. The radius of the wheel is 25.5cm. When he gets on, the valve of the wheel is at its maximum height. He pedals along a path at a speed of 30km/h. At what height will the valve be located after he has cycled for 4 minutes? How do I find...

*Saturday, April 28, 2012 by Anonymous*

**Trig Help!**

Question: Trying to find cos π/12, if cos π/6 = square root 3 over 2, how to find cos π/12 using DOUBLE angle formula? This is what I got so far.. cos 2(π/6) = cos (π/6 + π/6) = (cos π/6)(cos π/6) - (sin π/6)(sin π/6) = cos^2...

*Friday, April 27, 2012 by Anonymous*

**Solving Trig equation**

Solve the trig equation exactly in the interval 0≤x≤2π. tan x + tan π/3 ------------------ = square root 3 1 - tan x tan π/3

*Friday, April 27, 2012 by Anonymous*

**trig**

Consider the trigonometric function f(t) = -3+4cos(pi/3(t-3/2)) What is the amplitude/period of f(t)? What are the maximum and minimum values attained by f(t)?

*Friday, April 27, 2012 by Dave*

**alg2/trig**

how would you express cos(75 as a single fraction?

*Thursday, April 26, 2012 by lisa*

**Trig Question**

Given that tan x= -3/4 and x is in the second quadrant. Find sin 2x, cos 2x, and tan 2x (Exact, no decimals). Please show step-by-step, thank you!

*Thursday, April 26, 2012 by Anonymous*

**trig**

(sec6x+sin2x)/(sin6x-sin2x)=tan4xcot2x

*Wednesday, April 25, 2012 by mike*

**trig**

Prove that if Sinx=5/13 and Siny=12/13, where x and y angles in Q1, then Sin(x+y)=1

*Tuesday, April 24, 2012 by Anonymous*