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March 31, 2015

March 31, 2015

**Recent Homework Questions About Trigonometry**

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**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 at 7:24pm*

**Trig/advance math concepts**

state the amplitude, period, and phase shift of the function -0.4 sin (10x+pie/2)
*Monday, November 7, 2011 at 2:00am*

**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 at 12:37am*

**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 at 12:29am*

**trig**

write a product of two trig functions that equals 1.
*Sunday, November 6, 2011 at 9:38pm*

**trig**

write an equation expressing 19cos(theta-50degrees) as a sum of sine and cosine.
*Sunday, November 6, 2011 at 9:19pm*

**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 at 7:26pm*

**trig**

write equations expressing: 19cos(theta-50degrees) as a sum of sine and cosine.
*Sunday, November 6, 2011 at 7:13pm*

**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 at 6:20pm*

**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 at 6:17pm*

**trig**

Find exact value of the expression. sin( 27pi/4 + 17pi/6)
*Friday, November 4, 2011 at 12:10pm*

**trig**

y= -(x-5)2 -3
*Thursday, November 3, 2011 at 5:59pm*

**Trig**

Solve 2cosxsinx + sinx = 0 using unit circle.
*Wednesday, November 2, 2011 at 10:03pm*

**Trig**

Solve 2cos sq x = 1 using the unit circle.
*Wednesday, November 2, 2011 at 10:02pm*

**Trig**

Find all real numbers that satisfy the equation. 2 cos x + 1 = 0
*Tuesday, November 1, 2011 at 7:40pm*

**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 at 1:14am*

**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 ...
*Saturday, October 29, 2011 at 3:57pm*

**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 at 3:28pm*

**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 at 10:12pm*

**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 at 5:38pm*

**trig**

given the following values, what is angle B? A= 46 degree b= 4 c= 8
*Friday, October 28, 2011 at 12:44am*

**trig derivatives**

How do I find the derivative of 6 + 8cosx?
*Thursday, October 27, 2011 at 11:21pm*

**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 at 6:25pm*

**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 ...
*Thursday, October 27, 2011 at 6:08pm*

**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&#...
*Thursday, October 27, 2011 at 5:52pm*

**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 at 1:35am*

**Calc**

How do you do the derivative of an inverse trig function? arcsin (sqrt2/2)??
*Wednesday, October 26, 2011 at 10:18pm*

**trig**

Find another angle theta between 0 and 2pi that has the same cosine as 3pi/14
*Wednesday, October 26, 2011 at 9:34am*

**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 ...
*Tuesday, October 25, 2011 at 11:45pm*

**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 at 8:48pm*

**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 at 8:08pm*

**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 at 8:03pm*

**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 at 5:34pm*

**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 at 5:23pm*

**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 at 2:13pm*

**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 at 12:53pm*

**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....
*Saturday, October 22, 2011 at 12:45pm*

**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 at 4:12pm*

**trig**

Find value of tan75/2
*Friday, October 21, 2011 at 2:29pm*

**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 at 1:26am*

**trig**

Solve system of inequalities by graphing Y<2-x Y>x+4
*Thursday, October 20, 2011 at 8:31pm*

**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 at 11:10pm*

**trig**

sinx=square root of 3 over 2, cosx=1 over 2 i want to find all six trigonometric functions
*Wednesday, October 19, 2011 at 12:54am*

**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 at 4:23pm*

**trig**

50 feet
*Monday, October 17, 2011 at 11:06pm*

**trig**

cos 8 degrees fo feet 25 inches??
*Monday, October 17, 2011 at 11:05pm*

**trig**

if x=4 tan theta, express cos(2 theta) as a function of x
*Monday, October 17, 2011 at 10:21pm*

**trig**

find the exact values of the six trig functions of theta equals six pi divided by 8
*Monday, October 17, 2011 at 9:01pm*

**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 at 6:54pm*

**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 at 6:43pm*

**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 at 9:15am*

**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 ...
*Monday, October 17, 2011 at 1:31am*

**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 at 10:31pm*

**Trig**

Factor and simplify the expression. 1-sin^3 x
*Sunday, October 16, 2011 at 3:29pm*

**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 at 3:32am*

**Trig**

Find the exact value of tan 5pi/12 using the half-angle identity.
*Saturday, October 15, 2011 at 6:39pm*

**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 at 8:36pm*

**trig**

evaluate cos 12*pi
*Thursday, October 13, 2011 at 11:10am*

**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 at 11:38pm*

**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 at 5:03am*

**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 at 10:01pm*

**trig**

Find the exact value by using a half-angle identity. cos 22.5 degrees
*Tuesday, October 11, 2011 at 9:19pm*

**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 at 8:54pm*

**trig**

Given that sin theta= 3/5 and the terminal side is in quadrant II, find tan (pi/2 - theta)
*Tuesday, October 11, 2011 at 8:06pm*

**trig**

PERIMETER OF A RECTANGLE IS 32CM AND AREA IS 55CM FIND THE LENGHT.
*Tuesday, October 11, 2011 at 6:48pm*

**trig**

Find tanx if sinx = 3/4 and x is in quadrant II.
*Tuesday, October 11, 2011 at 1:45pm*

**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 at 5:18pm*

**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 at 10:40pm*

**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 at 5:14pm*

**trig**

I have to factor the expression and use fundamental identities: sins^2xcscx^2-sin^2x sec^4x-tan^4x
*Friday, October 7, 2011 at 9:32pm*

**trig**

evaluate the expression below at t=4 p=$400 and r=-9% round youre answer 2 decimal place
*Friday, October 7, 2011 at 12:38am*

**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 at 8:38pm*

**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 at 8:17pm*

**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 at 4:51pm*

**trig**

Solve sin ¥è = -0.204 for 90¨¬ < ¥è < 270¨¬. Give your answer to the nearest tenth of a degree.
*Wednesday, October 5, 2011 at 3:36pm*

**trig**

what is the hietgh difference between 2 walls 6 metres apart to get a 17.5 degree pitch
*Tuesday, October 4, 2011 at 2:53pm*

**trig**

if cot 17 degrees = 3.2709, find tan 73 degrees
*Tuesday, October 4, 2011 at 10:25am*

**trig**

1-cos/1+cos= 2(cosec-cot)
*Monday, October 3, 2011 at 12:08am*

**trig**

Find all solutions to the equation 2cos(2x) = x + 1, correct to 4 decimal places.
*Sunday, October 2, 2011 at 5:12pm*

**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 at 3:12pm*

**trig**

Graph y=-2sin(x/2-pi/2)+3
*Sunday, October 2, 2011 at 10:45am*

**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 at 4:44am*

**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 at 10:02pm*

**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 at 11:19am*

**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 at 12:46pm*

**trig**

A pilot is flying over a straight highway. He determines the angles of depression to two mileposts, 4 mi apart, to be x = 27° and y = 53°, as shown in the figure. (Round your answers to two decimal places.) (a) Find the distance of the plane from point A. mi (b) Find ...
*Friday, September 30, 2011 at 12:35pm*

**trig**

All solutions in interval [0,2pi) of cosine theta plus one equals zero
*Thursday, September 29, 2011 at 6:22pm*

**trig**

All solutions in interval [0,2pi) of cosine theta plus one equals zero
*Thursday, September 29, 2011 at 6:21pm*

**trig**

A cashier is unsure whether a group of customers ordered and ate a large or a medium pizza. Medium pizzas have a diameter of 12 inches and large pizzas have a diameter of 16 inches. All that remains is one crust that has an arc length of 4.25 inches. All pizzas are divided ...
*Wednesday, September 28, 2011 at 7:00pm*

**trig**

From a point 45 meters above level ground, a surveyor measures the angle of depression of an object on the ground at 68°. Approximate the distance from the object to the point on the ground directly beneath the surveyor. (Round your answer to two decimal places.)
*Wednesday, September 28, 2011 at 4:54pm*

**trig**

Cos(2x+30)-Sin(3x-20)
*Wednesday, September 28, 2011 at 5:33am*

**trig**

Find a cofunction with the same value as sin 19 degrees
*Tuesday, September 27, 2011 at 5:55pm*

**trig**

Find all values of x in the interval [0, 2π] that satisfy the equation. 6 sin2(x) = 3
*Tuesday, September 27, 2011 at 5:13pm*

**trig**

Suppose that the point P(13,-30) is on the terminal side of the angle theta in standard position. What is sin(theta)? Give your answer to the nearest thousandth
*Tuesday, September 27, 2011 at 2:56pm*

**trig**

Suppose that the point P is the point on the unit circle that is associated by the wrapping function with the number 31. In which quadrant is the point P located?
*Tuesday, September 27, 2011 at 2:56pm*

**Trig!**

The identities cos(a-b)=cos(a)cos(b)sin(a)sin(b) and sin(a-b)=sin(a)cos(b)-cos(a)sin(b) are occasionally useful. Justify them. One method is to use rotation matricies. Another method is to use the established identities for cos(a+b) and sin (a+b).
*Tuesday, September 27, 2011 at 12:21pm*

**maths**

in right angled triangle ABC, angleBis90 degree and C is an acute angle of60degree. Also sin m<C=c/b. Find the following trig ratios.(a)mBC/mAB (b)cosec30degree
*Tuesday, September 27, 2011 at 9:07am*

**Alg/2 Trig**

Given the functions f(x)=-x^2+7 and g(x)=3x+4 find f(g(-5)) Write the composition above using an alternative notation.
*Monday, September 26, 2011 at 10:44pm*

**trig**

P(2, 9) is a point on the terminal side of è in standard position. What is the exact value of tan è?
*Monday, September 26, 2011 at 6:23pm*

**Trig**

Given sin theta = -3/5 and 0 is in quad 2, find Cos theta and tan theta
*Wednesday, September 21, 2011 at 10:19pm*

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