74 Answered Questions for the topic Trigonometry Identities

Trigonometry Identities

02/17/17

#### Using trig Identities, I need to solve this question

sinxcos^4x+cos^6x=

Trigonometry Identities

02/09/17

#### Express cos^(4)2x in terms of cosine with an exponent of 1?

Hi, this is my first time using this site.
So I have been staring at this trigonometric equation for a long while and looking for what it asks for. For what I know, I think I have to use sum of...
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Trigonometry Identities Identities

12/14/16

#### Trig Identity

Prove sin4x = 4 (sin x-2 sin^3 x)/secx
I can't seem to solve this! Halp!!!

12/03/16

#### Simple Trig, got lost and need help.

Solve the given equation over the interval [0,2): 2sinx+ (sqrt 3) sin^2x=-(sqrt 3) cos^2x
A. x=0, and x=(pi/2), and x=(3 pi/2), and x=2(pi)x=(3 pi/2), and x=(7 pi/2)
b. x=(4 pi/3) and x=(5...
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11/30/16

#### Need Urgent Trig Help!!

Find the value for sin (θ) if the following conditions hold: cos(2(theta)) = 3/5 and 90(degrees) < (theta) < 180(degrees)
A. (1/25) B. (sqrt5/25) C. (2 sqrt5/5) D. (sqrt5/5)

Trigonometry Identities

11/06/16

#### Sin(45-x)=cos(45+x) prove the identity

Sin(45-x)=cos(45+x)
How to prove this identity?

06/12/16

#### Can someone walk me through simplifying sec(?)?^2 * cot(?) * cos(?) =

I thought it'd be (1 / cos(θ)2) * (1 / tan(θ)) * (cos(θ) / 1)
Which would get you cos(θ) / cos(θ)2 * tan(θ)
And then coming out to 1 / cos(θ) * tan(θ)
but that doesn't make sense...
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Trigonometry Identities

05/02/16

#### Write the expression as the sine or cosine of an angle.

cos7y cos3y -sin 7y sin3y= ?

Trigonometry Identities Trigonometry

04/02/16

#### Solve for x in the equation 4cos4x=0

i need step by step soln plz thank u

Trigonometry Identities

03/23/16

#### If cos(pi/2-X) =4/5. Find sin(-x)

Please help me solve this equation to better help me to understand trig Identites.

Trigonometry Identities

03/15/16

#### Find the exact value if sin x= -5/13, cos y= 4/5, 3pi/2<x<2pi, and 3pi/2<y<2pi what is tan(x+y)

I am a little confused on this and it would be nice if someone could work through it so I can understand this problem

11/29/15

#### Please help me with these identity proofs!!

1) (cscx + cotx) / (tanx + sinx) = cotxcscx
2) (1/secx) -secx = -sinx
3) (1-tan^2x / 1-cot^2x) = -tan^2x

11/24/15

#### cos(11pi/12) using Sum and difference identities

could someone explain finding cos(11pi/12) using Sum and difference Identities.
it must use one of...
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Trigonometry Identities Trigonometry

10/25/15

#### sin^2 x/2 = tanx-sinx/2tanx

=(sinx/cosx - sinx)/ (2sinx/cosx) = sinx-sinxcosx/cosx • cosx/2sinx = sinx (1-cosx)/2sinx = 1-cosx/2 now im lost help!!

10/24/15

#### Express cos4x as a trig function of x

Using only the double angle identities how to solve for this? im stucked after 2cos^2 (2x) -1

Trigonometry Identities Trigonometry

10/22/15

#### 1/8sin29.5cos29.5

I know that i should multiply something to it for it to become 2sinAcosA for me to be able to solve it. Unfortunately, if i multiply2/2 to it will just become 2/16 that will just bounce back to 1/8...
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Trigonometry Identities Trigonometry

10/19/15

#### Tan(theta+30)

tana+tanb/1-tanatanb
im confused becase sqrt of 3 over 3 is the value of tan 30 so its hard to solve the arithmetic and the algebra. help please!

10/07/15

#### Verify/prove: (1-cos^2x)(1+cos^2x) = 2sin^2x-sin^4x

I chose to manipulate the left hand side. So i got 1+cos2x-cos2x-cos4x
when i simplify it will be 1-cos4x i will break it into pieces so (1-cos2x)(1+cos2x) i can change the first term to sin so...
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Trigonometry Identities Trigonometry

10/03/15

#### Find the solutions of the equation that are in the interval [0, 2p). (Enter your answers as a comma-separated list.

If there is no solution, enter NO SOLUTION.) 2 -2 sin t = 2 sqrt(3)cos t
My solutions were pi/2, 7pi/6, and 11pi/6.

Trigonometry Identities

04/27/15

#### Trig identities!

Please help, I have no idea!
Solve the following trigonometric equation sin^2x - cos^2x = 1/4.

Trigonometry Identities Trigonometry

01/08/15

#### How can I solve sin(2x) = sin(x/2) for all values of x?

I can find x = 0, and also can show that cos x = (1/4)*(-1+/-sqrt(5)), but I don't know how I should have known that the latter cosines of x correspond to angles involving fifths of pi (radians)?...
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Trigonometry Identities Trigonometry

01/03/15

#### Solve for all values of 2sinx-1=0. in terms of pi

(show work) where 0≤x<2π

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