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71 Answered Questions for the topic Trigonometry Identities

Trigonometry Identities Trigonometry Trig


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... more
Trigonometry Identities Trigonometry Trig


Need help with simple Trig!

Provide an exact evaluation of the expression: tan (-285°).
Trigonometry Identities Trigonometry Math Help


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


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

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


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... more
Trigonometry Identities


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

cos7y cos3y -sin 7y sin3y= ?
Trigonometry Identities Trigonometry


Solve for x in the equation 4cos4x=0

i need step by step soln plz thank u
Trigonometry Identities


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


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
Trigonometry Identities Precalculus Trigonometry


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
Trigonometry Identities Trigonometry Pre Calculus


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... more
Trigonometry Identities Trigonometry


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!!
Trigonometry Identities Trigonometry Trigonometry Functions


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



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... more
Trigonometry Identities Trigonometry



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!


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... more
Trigonometry Identities Trigonometry


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


Trig identities!

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


prove the identity

Trigonometry Identities Trigonometry


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)?... more
Trigonometry Identities Trigonometry


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

(show work)  where 0≤x<2π  
Trigonometry Identities


How to prove this identity

tan3x - tan2x- tanx = tan3xtan2xtanx
Trigonometry Identities


verify identity

Trigonometry Identities Math Trigonometry


Rewrite 6(sin5x)cos2x

This is for my trig class. Thanks for the help!
Trigonometry Identities Math Trigonometry


Use the sum or difference formulas to determine: A. sin105 degrees B. tan15 degrees

This is for my trig class. Thanks for the help!

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