# Homework Help: Math: Trigonometry

## Recent Homework Questions About Trigonometry

**Trig**

cos(-11pi/12)

*Sunday, November 13, 2011 by Lauren*

**Algebra/trig**

How would i use my calculator to find the approximate value of the expression, cot 0.2748 rad

*Sunday, November 13, 2011 by Anonymous*

**trig**

Find theta such as tan(theta) = cot(theta+45). Thanks

*Saturday, November 12, 2011 by Mari*

**trig**

How to do this one? (sina/1-cosa) + (1-cosa/sina) = Also, wanted to ask if I did another one right: 1 - sin^2a + tg^2a * cos^2a = 1 - sin^2a + (sina/cosa)^2 * cos^2a = 1 - sin^2a + sin^2a = 1 ???

*Saturday, November 12, 2011 by Evelina*

**trig**

Please help me how to do this: 1) 1 + sina*cosa / (cosa + sina)^2 = 2) sina + cosa / 1- 2sin^2a =

*Saturday, November 12, 2011 by Evelina*

**trig**

determine the phase shift of y = sin(3x - 2pi). indicate whether the shift is to the right or left.

*Friday, November 11, 2011 by clarence*

**trig**

I have these sum and product property problems and I just want to make sure my work is right. Write equations expressing 1. cos 37degrees cos99degrees as a sum Answer: sin136+(-62) 2. sin4+sin7 as a product Answer: 2sin5.5 sin-1.5 3. cos 8x - cos 2x as a product Answer -2sin5x...

*Friday, November 11, 2011 by Kevin*

**trig/math**

If A is between 270degrees and 360degrees, and cos A=12/13, find the exact value of: sin2a, cos2a, sin1/2a, cos1/2a

*Friday, November 11, 2011 by Bob*

**trig**

whatis the possibilities for the square root of 2 times tan theta = 2 sin theta

*Friday, November 11, 2011 by Anonymous*

**trig**

To the nearest degree, determine the measure of <X for each value of tan X if the tan X = 0.25

*Tuesday, November 8, 2011 by dina*

**trig**

Two office towers are 43m apart. From the top of the shorter tower, the angle of elevation to the top of the taller tower is 26o while the angle of depression to the base is 51o. Determine the height of each tower and round your answers to one decimal place.

*Tuesday, November 8, 2011 by max*

**trig**

a tree growing on a hillside casts a 102-foot shadow straight down the hill. Find the vertical height of the tree if, relative to the horizontal, the hill slopes 15.0 degrees and the angle of elevation of the sun is 62.0 degrees.

*Tuesday, November 8, 2011 by jc*

**trig**

whats 21° 44' 3" as a decimal to the nearest thousandth of a degree

*Monday, November 7, 2011 by trey*

**trig**

find all the values of x that satisfy the equation: 2sin^2(x) + 1 = 3sin(x).

*Monday, November 7, 2011 by lisa*

**trig**

What is inverse cot of negative radical 3/3

*Monday, November 7, 2011 by damian*

**Trig**

Im having serious issues with verifying Trig. identities. Please help! Here is an example: (tanX-secX)^2= 1-sinX/1+sinX

*Monday, November 7, 2011 by Rachel*

**Trig/advance math concepts**

state the amplitude, period, and phase shift of the function -0.4 sin (10x+pie/2)

*Monday, November 7, 2011 by Cilla*

**trig**

given that sin(a+b)= 56/65, cos(a+b)-33/65, cos(b)=-12/13 and pi/2<b<pi Find: sin(a)? cos(a)? tan(a)?

*Monday, November 7, 2011 by jared*

**Trig**

Prove the following functions: (sinx+sin2x)/(1+cosx+cos2x)=tan x (cos3x/sinx)+(sin3x/cosx)=2cot2x tan2x=(2/cotx-tanx) theses are due in the am. Fastness would be great?

*Monday, November 7, 2011 by jared*

**trig**

write a product of two trig functions that equals 1.

*Sunday, November 6, 2011 by Dani*

**trig**

write an equation expressing 19cos(theta-50degrees) as a sum of sine and cosine.

*Sunday, November 6, 2011 by Kate*

**trig**

write an equation expressing: cos37cos99 as a sum Review question. I know the formula. Having trouble with working it out.

*Sunday, November 6, 2011 by Gaile*

**trig**

write equations expressing: 19cos(theta-50degrees) as a sum of sine and cosine.

*Sunday, November 6, 2011 by Don*

**Math C30 ( trig )**

A roof in the shape of an upside down cosine wave is to be buile to cover an arena. The arena is 24m wide, the height of the roof at either side wall is 5m, and the maximum height of the roof is 9m. A) write a function that gives the height of the roof in terms of your ...

*Sunday, November 6, 2011 by Don*

**Math C30 ( trig )**

Solve : cosxtanx + root3cosx - root3/2tanx - 3/2 = 0 Give exact answers and formula for the general solution as well as the specific solutions.. Help

*Sunday, November 6, 2011 by Don*

**trig**

Find exact value of the expression. sin( 27pi/4 + 17pi/6)

*Friday, November 4, 2011 by Brianna*

**trig**

y= -(x-5)2 -3

*Thursday, November 3, 2011 by shanteria*

**Trig**

Solve 2cosxsinx + sinx = 0 using unit circle.

*Wednesday, November 2, 2011 by don*

**Trig**

Solve 2cos sq x = 1 using the unit circle.

*Wednesday, November 2, 2011 by don*

**Trig**

Find all real numbers that satisfy the equation. 2 cos x + 1 = 0

*Tuesday, November 1, 2011 by Anonymous*

**trig**

Hi, I need to find the domain and rnge of the following: 1. X= 1/2 (cos theta + theta sin theta) Y=1/2 (sin theta - theta cos theta) total guess here, but here goes Domain cos theta = +/- 1 and domain sin theta = +/- 1 so domain theta sin theta = 0- +/-infinity so domain of X...

*Monday, October 31, 2011 by Courtney*

**trig**

I'm confused with this concept: Okay, so I have this problem: cos2x( 2 cos+1)= 0 I understand I have to work the problems separately and I get cos x= 2 and cos x= 1/2 Now, what I don't understand is how this connects to pi, radians or the unit circle. If someone could explain ...

*Saturday, October 29, 2011 by Anonymous*

**Trig**

Find the measure of the central angle, in radians, given the area of the sector as 22.6 cm2 and a radius equal to 3.7 cm

*Saturday, October 29, 2011 by Julianne*

**trig**

(3 tan^2x-1)(tan^2-3)= 0 can someone please explain how to do this problem and then explain the whole pie thing at the end...like, this is suppose to equal pie/6 b/c it's tan...im soooo confused.....

*Friday, October 28, 2011 by help?*

**trig**

guy wire is attached to a pole for support. If the angle of elevation to the pole is 67° and the wire is attached to the ground at a point 137 feet from the base of the pole, what is the height of the pole (round to 2 decimal places)?

*Friday, October 28, 2011 by shye*

**trig**

given the following values, what is angle B? A= 46 degree b= 4 c= 8

*Friday, October 28, 2011 by rebecca*

**trig derivatives**

How do I find the derivative of 6 + 8cosx?

*Thursday, October 27, 2011 by lily*

**trig**

L ii i i i i i i i i A i i i i i i i i i i 4000 miles i i i i E ii right triangle have to find side EL. The range of a lighthouse is the maximum distance at which its light is visible. In the figure, point A is the farthest point from which it is possible to see the light at ...

*Thursday, October 27, 2011 by Taylor*

**trig**

Since its construction in 1821, Marblehead Lighthouse has stood at the entrance to Sandusky Bay, guiding sailors along Lake Erie’s rocky shores. The 65-foot tower is one of Ohio’s best-known landmarks and the oldest continuously operating lighthouse on the Great Lakes. 1. ...

*Thursday, October 27, 2011 by Taylor*

**trig**

The Hall of Fame exhibits are displayed in an eight-story, 162-foot tower. Pei originally designed a 200-foot tower, but had to reduce its height to meet the requirements of a nearby airport. From the top of the existing tower, an observer sights the entrance to the museum’s...

*Thursday, October 27, 2011 by Taylor*

**Trig/Algebra II**

(3+√2)/(3-√2) is equivalent to: a. (11+6√2)/ 7 b. (11-6√2)/ 7 c. 11/7 d. 7/ (11+6√2)

*Thursday, October 27, 2011 by Lily*

**Calc**

How do you do the derivative of an inverse trig function? arcsin (sqrt2/2)??

*Wednesday, October 26, 2011 by Hannah*

**trig**

Find another angle theta between 0 and 2pi that has the same cosine as 3pi/14

*Wednesday, October 26, 2011 by Anonymous*

**Algebra**

algebra 2 trig: A food vendor at a stadium sells hot dogs for $2. At this price, she can sell about 500 hot dogs per day. For every $.25 increase in price, she will sell 25 less hot dogs. The vendor's revenue can be modeled by R=(500-25x)(2+0.25x) Use vertex form to find how ...

*Tuesday, October 25, 2011 by Steve*

**trig**

let P be a point in Q1 such that the slope of the line connecting P to the origin is sq. root of 2 and the distance from P to the origin is 3 units. Find the coordinates of P, state all trig values for angle formed by the line and the positive x-axis, and the measure of said ...

*Tuesday, October 25, 2011 by Chelci*

**trig**

Find the values of the other five trigonometric functions for angle S. a) cos S=1/3 and the terminal side of angle S is in Q1. b) tan S=-10/7 and the terminal side of S is in Q2. c) sin S=-5/14 and the terminal side of S is in Q3. d) sec S=13/11 and the terminal side of angle ...

*Tuesday, October 25, 2011 by Chelci*

**trig**

Find the values of the other five trigonometric functions for angle S. a) cos S=1/3 and the terminal side of angle S is in Q1. b) tan S=-10/7 and the terminal side of S is in Q2. c) sin S=-5/14 and the terminal side of S is in Q3. d) sec S=13/11 and the terminal side of angle ...

*Tuesday, October 25, 2011 by Chelci*

**TRIG**

Verify the following identity. 1) sin(x+y) __________ = tanx+tany cosxcosy 2) Write cos3x in terms of cosx I cannot figure out how to solve for identities they are so hard. Any help appreciated!:)

*Sunday, October 23, 2011 by ALISON*

**TRIG**

1) Find an angle that makes the statement true: costheta =sin(3theta+10degrees) 2) Verify this proof: sec(Pie -x)= -secx Can someone show me how to solve for these. Very much appreciated!

*Sunday, October 23, 2011 by ALISON*

**Math trig**

a ladder 24 feet long leans against the side of a building, and the angle between the ladder and the building is 25°. a) approximate the distance from the bottom of the ladder to the building. b)if the distance from the bottom of the ladder to the buliding is increased by ...

*Saturday, October 22, 2011 by jule*

**math c30 trig**

Determine the period length of y= 2/3 sin (3x/2 ) I had 3pi/2 but the correct answer is 4pi/3 how do you get that???

*Saturday, October 22, 2011 by don*

**trig**

as a hot air balloon rises vertically, its angle of elevation from point P on level ground 110 kilometers from th epoint Q directly underneath the balloon changes from 15 degree 5' to 31 degree 45'. Approximately how far does the balloon rise during this period? a. 38.4 km b. ...

*Saturday, October 22, 2011 by sam*

**trig**

If S is an element of [ 3pi/2 , 2pi ] what quadrant does the terminating side lie in and evaluate for sine theta

*Friday, October 21, 2011 by Keith*

**trig**

Find value of tan75/2

*Friday, October 21, 2011 by Ram*

**trig**

Q1: In a right-angle triangle the base is 50 m long and its height is 40 m .find its area

*Friday, October 21, 2011 by Anonymous*

**trig**

Solve system of inequalities by graphing Y<2-x Y>x+4

*Thursday, October 20, 2011 by theo*

**trig**

what angle in degrees am i if the following is true: sin t > cos t if i were in quadrant three, sin t=cos t

*Wednesday, October 19, 2011 by michal*

**trig**

sinx=square root of 3 over 2, cosx=1 over 2 i want to find all six trigonometric functions

*Wednesday, October 19, 2011 by fausto*

**trig**

A water-park slide covers 100 feet of horizontal space and is 36 feet high. A new replacement slide will create an angle with the water surface that measures twice that of the original slide. The new slide will use the same horizontal space as the old slide. What is the height...

*Tuesday, October 18, 2011 by Parker*

**trig**

50 feet

*Monday, October 17, 2011 by ..*

**trig**

cos 8 degrees fo feet 25 inches??

*Monday, October 17, 2011 by ..*

**trig**

if x=4 tan theta, express cos(2 theta) as a function of x

*Monday, October 17, 2011 by Lisa*

**trig**

find the exact values of the six trig functions of theta equals six pi divided by 8

*Monday, October 17, 2011 by don*

**trig**

the basic N of an antenna rests on horizontal ground. the angle of elevation of the top R from a pt H on the ground is 42 degrees

*Monday, October 17, 2011 by Anonymous*

**trig**

A third point C lies on the ground 5.4m from N the angle of depression of C from R is X degrees. Calculate to the nearest degrees the value of X.

*Monday, October 17, 2011 by Anonymous*

**trig**

as the sun rises it casts a long shadow over a boy who is leaning next to a tree. the tree is 35 feet tall and the sun's rays create an angle of depression of 70 degrees with the top of the tree. how long is the shadow

*Monday, October 17, 2011 by Anonymous*

**trig**

Two pilots take off from the same airport. Mason heads due south. Nancy heads 23º west of south. After 400 land miles, how far is Nancy from Mason’s route? Round your answer to the nearest tenth of a mile. (Enter only the number.)(If someone had helped me with the one ...

*Monday, October 17, 2011 by Parker*

**trig**

A hill rises from the horizontal at 15º. The road leading straight up the hill is 800 meters long. How much higher is the top of the hill than the base of the hill? Round to the nearest meter. (Enter only the number.)

*Sunday, October 16, 2011 by Parker*

**Trig**

Factor and simplify the expression. 1-sin^3 x

*Sunday, October 16, 2011 by Amber*

**trig**

Alan is using the equation mg sin A = umg cos A to determine the coefficient of friction, u, between a flat rock and a metal ramp. Find u to the nearest hundredth, if the rock begins to slide at 19º.

*Sunday, October 16, 2011 by Parker*

**Trig**

Find the exact value of tan 5pi/12 using the half-angle identity.

*Saturday, October 15, 2011 by Cynthia*

**alg2/trig**

The expression a/a-b + b/b-a is equivalent to a) 1 b)-1 c) ab/a-b d)a+b/a^2-b^2 please help!

*Thursday, October 13, 2011 by jess*

**trig**

evaluate cos 12*pi

*Thursday, October 13, 2011 by rene*

**trig**

To the nearest degree, determine the measure of angle X for each value of tan X a. tan X = 0.49 Just not sure how to solve these questions

*Wednesday, October 12, 2011 by David*

**trig**

tan x = n tan y, sin x = m sin y then prove that m^2-/n^2-1 = cos^2x

*Wednesday, October 12, 2011 by samuel r. edward*

**trig**

THE SIDE OF A RIGHT-ANGLED TRIANGLE ARE 3XCM,3X-1CM AND 4X PLUS 1CM ,THE LAST SIDE BEING THE HYPOTHENUS FIND X.

*Tuesday, October 11, 2011 by JULIE*

**trig**

Find the exact value by using a half-angle identity. cos 22.5 degrees

*Tuesday, October 11, 2011 by Omar*

**trig**

Given that tan B= 7/24 with B in quadrant III, find sin 2B, cos 2B, and tan 2B, using angle identities.

*Tuesday, October 11, 2011 by Ryan*

**trig**

Given that sin theta= 3/5 and the terminal side is in quadrant II, find tan (pi/2 - theta)

*Tuesday, October 11, 2011 by Ryan*

**trig**

PERIMETER OF A RECTANGLE IS 32CM AND AREA IS 55CM FIND THE LENGHT.

*Tuesday, October 11, 2011 by Anonymous*

**trig**

Find tanx if sinx = 3/4 and x is in quadrant II.

*Tuesday, October 11, 2011 by Amber*

**trig**

Consider the angle in standard position whose measure is radians. The terminal side of this angle is in the third quadrant and lies on the line given by y=10x. Find sin and cos.

*Monday, October 10, 2011 by yo*

**trig**

A rocket is launched at an angle of ascent (elevation) of 18 degrees. When it has traveled 6000 ft, what is its height above the ground?

*Sunday, October 9, 2011 by Bridgette*

**trig**

a tower standing on level ground is due north of piont N and due west of point W, a distance 1,500 feet from N. If the angles of elevation of the top of the tower as measured from N and W are 8 and 11, respectively, find the height of the tower.

*Sunday, October 9, 2011 by courtney*

**trig**

I have to factor the expression and use fundamental identities: sins^2xcscx^2-sin^2x sec^4x-tan^4x

*Friday, October 7, 2011 by Help pleaseee*

**trig**

evaluate the expression below at t=4 p=$400 and r=-9% round youre answer 2 decimal place

*Friday, October 7, 2011 by joe*

**trig**

in a circle of radius 26, find the length of the arc spanned by a central angle of pi/4 radians. round your answer to 2 decimal places. use 3.1416 as an approx for pi.

*Wednesday, October 5, 2011 by tiana*

**trig**

Triangle PQR is congruent to P'Q'R. If PQ= x+y, P'Q'+10, Q'R'= 3x-y, and QR=14, then what is x and y?

*Wednesday, October 5, 2011 by Beth*

**trig**

Solve for ¥è in the equation tan ¥è = 2.42 when 180¨¬ < ¥è < 360¨¬. Round your answer to the nearest tenth of a degree. (Enter only the number.)

*Wednesday, October 5, 2011 by Parker*

**trig**

Solve sin ¥è = -0.204 for 90¨¬ < ¥è < 270¨¬. Give your answer to the nearest tenth of a degree.

*Wednesday, October 5, 2011 by Parker*

**trig**

what is the hietgh difference between 2 walls 6 metres apart to get a 17.5 degree pitch

*Tuesday, October 4, 2011 by Anonymous*

**trig**

if cot 17 degrees = 3.2709, find tan 73 degrees

*Tuesday, October 4, 2011 by james*

**trig**

1-cos/1+cos= 2(cosec-cot)

*Monday, October 3, 2011 by Aqib*

**trig**

Find all solutions to the equation 2cos(2x) = x + 1, correct to 4 decimal places.

*Sunday, October 2, 2011 by sam*

**alg2/trig**

Which expression is defined for all real numbers? a) x + 3/x^2 b) 5/(x + 2)^2 c)4/(x − 2)^2 d)7/x^2 + 3

*Sunday, October 2, 2011 by jaz*

**trig**

Graph y=-2sin(x/2-pi/2)+3

*Sunday, October 2, 2011 by Anonymous*

**trig**

Question Part Points Submissions Used The angle of elevation to the top of a very tall Building is found to be 7° from the ground at a distance of 1 mi from the base of the building. Using this information, find the height of the building.

*Sunday, October 2, 2011 by sanam*

**trig**

Triangle XYZ has vertexes at X(-4, 5), Y(-3, 5), and Z(-3, 4). Find the measure of angle Y to the nearest degree.

*Saturday, October 1, 2011 by Parker*

**trig**

The captain of a ship at sea sights a lighthouse which is 120 feet tall. The captain measures the the angle of elevation to the top of the lighthouse to be 19 ^\circ. How far is the ship from the base of the lighthouse?

*Saturday, October 1, 2011 by Dan*

**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.) cos θ = 1/7

*Friday, September 30, 2011 by stellar*