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July 31, 2014

July 31, 2014

**Recent Homework Questions About Trigonometry**

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**trig**

By expressing 3x as (2x + x) prove that cos3x = 4cos^3x - 3cosx
*Tuesday, December 13, 2011 at 6:03pm*

**trig**

By expressing 3x as (2x + x) prove that cos3x = 4cos^3x - 3cosx
*Tuesday, December 13, 2011 at 6:03pm*

**trig/precalculus**

A crate weighing w pounds sits on a ramp positioned at an angle of x with the horizontal. The forces acting on this crate are modeled by the equation Mwcosx = wsinx, where M is the coefficient of friction. What is an expression for M in terms of x? A. M = tanx B. M = cotx C. ...
*Tuesday, December 13, 2011 at 10:49am*

**trig/precalculus**

A crate weighing w pounds sits on a ramp positioned at an angle of x with the horizontal. The forces acting on this crate are modeled by the equation Mwcosx = wsinx, where M is the coefficient of friction. What is an expression for M in terms of x? A. M = tanx B. M = cotx C. M...
*Tuesday, December 13, 2011 at 12:31am*

**Math - Trig**

For the equation 4 cos theta - square root 12 = 0, where 0 < theta < (or equal to) 2 pi, determine the measure of theta. The answers to choose from are: A) pi/ 3, 5 pi/ 3 B) 2 pi/ 3, 4 pi/ 3 C) 5 pi/ 6, 7 pi/ 6 D) pi/ 6, 11 pi/ 6 Please explain and show work, because I ...
*Monday, December 12, 2011 at 2:36pm*

**trig**

Find the exact value of the trigonometric function. -cot(pi/4 + 16pi)
*Monday, December 12, 2011 at 8:59am*

**trig**

How do you evaluate the expression cos3pi
*Sunday, December 11, 2011 at 10:14pm*

**trig**

A satellite is in geostationary orbit 22,500 miles above the earth. IF the radius of the earth is 3,960 miles, how fast is the satellite moving in miles per day? How fast is the satellite moving in miles per hour?
*Sunday, December 11, 2011 at 8:02pm*

**Math**

Trying to understand an inverse trig function. Evaluate Cos^-1 (sqr3/2) So I know it's 30 degrees, but wouldn't it also be 150 degrees because the Arc-cos is defined in the 2nd quadrant?
*Sunday, December 11, 2011 at 6:12pm*

**trig**

Getting ready for trig semester finals. Can't figure out how they are simplifying these equations. (these are the review not actual test) tanx-sqr3=2tanx and 2sin^2+sinx=0
*Sunday, December 11, 2011 at 4:49pm*

**trig**

How do I solve.... Tan 2(theta) - Cos 4(theta) = 0 Domain: (0-360 degrees) Thank you.
*Sunday, December 11, 2011 at 4:35pm*

**Math: Trig**

to determine the height of a pole across a road, Justin takes two measurments. he stands at Point A directly across from the bass of the pole and determines that the angle of elevation to the top of the pole is 15.3 degrees. he then walks 30m parallel to the freeway to point C...
*Sunday, December 11, 2011 at 4:00pm*

**trig**

How do i solve this equation over the interval [0degrees,360) cot(theta)+2csc(theta)=5
*Saturday, December 10, 2011 at 9:22pm*

**trig **

The manufacturer of a propeller for a small aircraft mandates a maximum operating angular velocity of 300 rad/s. Determine whether it is safe to install this propeller whose aircraft whose engine is expected to run at a maximum of 2800 rpm
*Saturday, December 10, 2011 at 8:09pm*

**trig**

If θ is an angle in standard position and its terminal side passes through the point (20,-21), find the exact value of sec(θ).
*Friday, December 9, 2011 at 11:36am*

**trig**

If (cosa-sina)/sina = 2 , then what is tga = ?
*Friday, December 9, 2011 at 11:21am*

**trig**

find an expression equivalent to sec theta sin theta cot theta csc theta
*Thursday, December 8, 2011 at 7:57pm*

**Math- Trig**

In an oblique triangle ABC, A=30 degree, and the perpendicular from C to AB is 12 inches long. Find the length of AB.
*Thursday, December 8, 2011 at 3:02pm*

**trig**

Prove that the statement is an identity: (tanx/cscx)=(1/cosx)-cosx
*Wednesday, December 7, 2011 at 10:31pm*

**trig**

tan theta= -4/3 and sec theta<0 find sin (theta = pi/6)
*Wednesday, December 7, 2011 at 7:39pm*

**Trig**

1. Establish the identity: sin(theta+3pi/2)=-cos(theta) 2. Find the exact value of 2(theta) if sin(theta)=5/13 3. Show that: csc2(theta)-cot2(theta)=tan(theta) 4. Find the exact value of tan(cos^-1(square root of 3/2) 5. Approximate the value rounded to two decimal places: csc...
*Wednesday, December 7, 2011 at 5:55pm*

**trig**

simplify: (2sin(2pie/7))/(3cos(3pie/14)
*Wednesday, December 7, 2011 at 2:52pm*

**trig**

I need to prove parallelogram law using the law of cosines. 2AB^2 + 2BC^2 = AC^2 + BD^2 Please, help me to do this.
*Wednesday, December 7, 2011 at 12:18pm*

**trig**

Cos 3 alpha = - 0.1 solutions in degree
*Wednesday, December 7, 2011 at 12:07pm*

**trig**

a right triangle contains a 25 angle. if me leg is of length 5 inches what is the length of the hypotenuse
*Wednesday, December 7, 2011 at 11:50am*

**trig**

CosA*Cos17=1 then determine A
*Wednesday, December 7, 2011 at 6:51am*

**Trig**

Sec (23π/6)
*Tuesday, December 6, 2011 at 4:25pm*

**Math - Trig please help!**

State two intervals in which the function y=7sin(1/5x)+2 has an average rate of change that is: a) zero b)a negative value c)a positive value Please explain how to get the intervals! Thanks a lot in advance!
*Monday, December 5, 2011 at 11:33pm*

**trig**

Find all the solutions of 2 sinx=1-cosx in the interval from 0° ≤x<360°
*Monday, December 5, 2011 at 9:35pm*

**trig**

if the terminal ray of an angle 0 in standard position passes through the point (-1,3),then cos0=
*Monday, December 5, 2011 at 6:20pm*

**trig**

find all solutions of 2sinx=1-cosx in the interval from 0 to 360
*Monday, December 5, 2011 at 5:27pm*

**precalc/trig**

Solve the Logarithmic equation algebraically. Give an Exact Answer and an approximation for x to four decimal places. 20 log(2x+2)=45
*Monday, December 5, 2011 at 2:01pm*

**precalc**

Suppose that z1=6-8i. Find: A. The Trig Form of the complex number z1, where your theta is in degrees. B. The Trig form of z1*z2, where z2=5[cos(60degrees)+isin(60degrees)] C. The Trig Form of (z1)^4
*Monday, December 5, 2011 at 1:34pm*

**trig**

Find the exact solutions of the equation in the interval [0,2pi). sin(x/2)+cos(x)=0
*Monday, December 5, 2011 at 12:40pm*

**trig**

We are doing trig identities in school. I need help with these five: 1.1+sinx/1-sinx=cscx+1/cscx-1 2.tanx+sinx/1+cosx=tanx 3.sec^2x/sin^2x=1/sin^2x+1/cos^2x 4.tan^2x/1+tan^2x=1-cos^2x 5.sinx-sin^3x/cos^3x=tanx
*Sunday, December 4, 2011 at 11:42am*

**trig**

a 30 foot ladder leans against a wall at a 71 degree angle of elevztion find the distance of a ladder's base to the wall
*Saturday, December 3, 2011 at 11:55pm*

**trig**

Mr. Saurik proposed that the function h(t) = 6sin(3pi(t) - pi/3) + 5, where h(t) is in meters and t is in seconds, models the height above the ground of a point on a spinning wheel. Is Mr. Saurik's equation plausible? Explain.
*Saturday, December 3, 2011 at 7:05pm*

**precalc/trig**

Write the partial fraction decomposition of the rational expression. 4x^2–19x+31/ (x+2)(x^2–4x+5)
*Saturday, December 3, 2011 at 11:19am*

**trig**

How to prove the theorem of sines, using S=(a*b/2) * sin γ ?
*Friday, December 2, 2011 at 11:18am*

**Math -Trig Please help!**

At one time, Maple Leaf Village (which no longer exists) had North America’s largest Ferris wheel. The Ferris wheel had a diameter of 56 m, and one revolution took 2.5 min to complete. Riders could see Niagara Falls if they were higher than 50 m above the ground. Sketch ...
*Thursday, December 1, 2011 at 10:11pm*

**trig**

express the product of radical 90 x radical 40 -radical 8 x radical simplifies to ?
*Thursday, December 1, 2011 at 7:50pm*

**trig**

Patients with acute or serious infections, such as Salmonella typhi or gram-negative bacteria causing meningitis, can be successfully treated with regular doses of Chloramphenicol. A patient weighing 150 pounds requires a dose of 850 milligrams, while a patient weighing 300 ...
*Wednesday, November 30, 2011 at 10:59pm*

**trig**

for what values of theta between 0 and 2 pi is the function of theta equal sine theta positive?
*Wednesday, November 30, 2011 at 9:43pm*

**trig**

I need to count this: a) 1-tg^2a/1+ctg^2a, when sina =2/3 b) 1-tg^2a/1-ctg^2a, when cosa= -1/3 c) tga * cos^2a, when sina + cosa=5/7 d) tg^2a + 1/sina * 1/cosa + ctg^2a, when tga + ctga =5
*Wednesday, November 30, 2011 at 11:33am*

**trig**

I need to prove equality. a) (sina + cosa)^2 -1 / ctga - sinacosa = 2tg^2a b) (sin^2x/sinx-cosx) - (sinx+cosx/tg^2x+1) = sinx + cosx c) sin^4a - sin^2a - cos^4a + cos^2a = cosπ/2 How to do these?
*Wednesday, November 30, 2011 at 8:09am*

**trig**

For the following expression, find the value of y that corresponds to each value of x, then write your results as ordered pairs (x,y). y=7cos(x-pi/6) for x=pi/6, pi/3, 2pi/3, pi, 7pi/6
*Tuesday, November 29, 2011 at 5:12pm*

**Math- Trig please help!**

A tire with a diameter of 100 cm rotates 20 times in 3 seconds. a) determine the angular velocity b) how far the tire has travelled? c) what is the speed in km/h?
*Tuesday, November 29, 2011 at 4:52pm*

**precalc/trig**

Find the trigonometric form of the number. (Round any angles to two decimal places.) −8 − i
*Tuesday, November 29, 2011 at 11:27am*

**trig**

Solve the equation for exact solutions over the interval [0, 2pi]. 4 cotx+2=-2
*Tuesday, November 29, 2011 at 11:14am*

**trig**

Write cot(t) in terms of sin(t) if the terminal point determined by t is in the first quadrant. Do not leave a fraction inside a radical or use absolute value.
*Monday, November 28, 2011 at 11:20pm*

**trig**

cos t=.7, tan t<0. find the values of the other 5 trigonometric functions.
*Sunday, November 27, 2011 at 1:42pm*

**trig**

find sin of theta if cos is less than 0 and cot equals 3
*Sunday, November 27, 2011 at 12:32pm*

**trig**

Use the Law of Sines to solve each triangle. P=110 degrees p=125, r=200 in triangel PQR
*Saturday, November 26, 2011 at 10:56pm*

**math/Right triangle trig**

Your favorite team is attempting a field goal. The ball is kicked at an angle of 45 degrees with the field. The ball covers a horizontal distance of 85 inches before the kick is blocked. What is the minimum height the opposing team's player can be to block the kick?
*Tuesday, November 22, 2011 at 1:13pm*

**Trig/Math**

RST is a triangle with right angle S. If s- 21.3 Angstroms and t=8.71 Angstroms, find the measure of the larger acute angle.
*Tuesday, November 22, 2011 at 11:15am*

**Trig**

Triangle ABC has B= 137degrees, A=31.6 in., and C=42.8 in. Find B.
*Tuesday, November 22, 2011 at 11:06am*

**trig**

In a rignt angle base is 20 mtr,adjacent side is 6 mtr, hypotenus is 20.88 mtr, what is the degree of angle of hypotenus and base
*Tuesday, November 22, 2011 at 1:27am*

**trig**

In a rignt angle base is 20 mtr,adjacent side is 6 mtr, hypotenus is 20.88 mtr, what is the degree of angle of hypotenus and base
*Tuesday, November 22, 2011 at 1:23am*

**trig**

if tan theta=7/24 and sin theta is greater than 0 what is the exact value of sin theta
*Monday, November 21, 2011 at 8:06pm*

**trig**

A and B are acute angles such that cosA =3 over 5 and cosB =12 over 13
*Monday, November 21, 2011 at 12:22pm*

**trig**

Find the exact value of the trigonometric function given that sin u = − 8/17 and cos v = − 3/5. (Both u and v are in Quadrant III.) cot(v − u)
*Sunday, November 20, 2011 at 3:40pm*

**Alg. II/Trig**

If m and n are real numbers, i^2=-1, and (m-n)-4i=7+ni, what is the value of m?
*Friday, November 18, 2011 at 1:11am*

**Trigonometry**

Help trig question involving discriminant? a)Find the value of the discriminant. b)Use any method to find the real roots of the equation if they exist. 2x^2+7x=0
*Thursday, November 17, 2011 at 6:52pm*

**trig**

5. If the angles X and Y each measure between 0° and 90°, and if sinX = cosY, what is the sum of the measures of the angles X and Y?
*Thursday, November 17, 2011 at 1:32pm*

**algebra/trig help please**

is this graphable??? y=x^2-4x-2
*Wednesday, November 16, 2011 at 6:55pm*

**trig**

-Find sin(x+y), cos(x-y), tan(x+y) and the quadrant of x+y sinx=-3/5, cosy=-7/25, x and y in Q3
*Wednesday, November 16, 2011 at 9:59am*

**trig**

What is the exact value of 19 pie divided by 12.
*Tuesday, November 15, 2011 at 8:33am*

**Trig**

The path of a projectile fired at an inclination t0 to the horizontal with initial velocity v feet per second is a parabola. The horizontal distance R, in feet, that the projectile travels is given by R = v2sin(2t)/32.2. What is R if v = 152 and t = 74? Give your answer to the...
*Monday, November 14, 2011 at 9:29pm*

**trig**

If sin(t) = -2/48 and cos(t) < 0 what is the value of cos(t) to the nearest thousandth? If sin(t) = -14/34 and cos(t) < 0, what is the value of tan(t) to the nearest thousandth? If tan(t) = -15/19 and sin(t) < 0, what is sin(t) to the nearest thousandth? If tan(t) = ...
*Monday, November 14, 2011 at 8:33pm*

**Trig**

Solve the equation in the given domain cos 4x + cos 2x = 0, 0<(or equal to) x < pi
*Monday, November 14, 2011 at 11:15am*

**trig**

an isosceles triangle has a perimeter of 60in. the congruent sides measure (2x+9)cm. the length of the third side is 3xcm. what is the value of X?
*Monday, November 14, 2011 at 12:26am*

**trig**

cosθ =5/13 with -π/2 < θ <0 find each of the following sin( θ - 5π/4) cos( θ - 11π/6) tan( θ + 5π/4) can some1 explain to me how to do these? im completely lost and this is the only thing about my assignment that i cant do can...
*Monday, November 14, 2011 at 12:23am*

**trig**

find the coordinates of the terminal point on the unit circle determined by t=9pt/7 to two decimal places
*Sunday, November 13, 2011 at 6:56pm*

**Math/trig**

Solve the equation in the given Domain: 1-cos theta/ sin theta = sqr3, 0degrees <or equal to theta < 369 degrees cos4x + cos 2x =0, 0<or equal to x < pi
*Sunday, November 13, 2011 at 4:53pm*

**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 -...
*Sunday, November 13, 2011 at 4:51pm*

**trig**

Cos(-11/12) use the sum or difference formula to find the exact number
*Sunday, November 13, 2011 at 3:24pm*

**Trig**

cos(-11pi/12)
*Sunday, November 13, 2011 at 3:23pm*

**Algebra/trig**

How would i use my calculator to find the approximate value of the expression, cot 0.2748 rad
*Sunday, November 13, 2011 at 6:05am*

**trig**

Find theta such as tan(theta) = cot(theta+45). Thanks
*Saturday, November 12, 2011 at 4:07pm*

**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 at 10:45am*

**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 at 9:06am*

**trig**

determine the phase shift of y = sin(3x - 2pi). indicate whether the shift is to the right or left.
*Friday, November 11, 2011 at 12:08pm*

**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 at 11:57am*

**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 at 11:32am*

**trig**

whatis the possibilities for the square root of 2 times tan theta = 2 sin theta
*Friday, November 11, 2011 at 10:27am*

**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 at 9:23pm*

**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 at 6:28pm*

**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 at 1:15am*

**trig**

whats 21° 44' 3" as a decimal to the nearest thousandth of a degree
*Monday, November 7, 2011 at 11:21pm*

**trig**

find all the values of x that satisfy the equation: 2sin^2(x) + 1 = 3sin(x).
*Monday, November 7, 2011 at 9:58pm*

**trig**

What is inverse cot of negative radical 3/3
*Monday, November 7, 2011 at 8:39pm*

**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*

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Post a New Question | Current Questions