suppose tanx = 3/4, where pi < x < 3pi/2 find the exact value of cos2x

Q: Evaluate the following leaving the result as an EXACT value. cos⁡(tan^-1⁡(4/3)+sin^−1⁡(−2/5))

A: We have to solve the problem

Q: Verify the identity: (cos 4x - cos 2x)/(sin 2x - sin 4x) = tan 3x

A:

Q: If tan x = -1/3, cos x > 0, then sin 2x = cos2x = tan 2x

A:

Q: Find the exact value of tan [ 2 sin-1 (-12/13) ]

A: Given,  tan 2 sin-1-1213  We have to find the exact value of the above expression

Q: Verify the identity sec-1 x = cos-1(1/x), for x ≠ 0.

A: According to the question, we have to verify the identity sec-1x=cos-11x. As the above function is…

Q: Find the exact value of sin195o

A: Find the exact value:

Q: Is Cscx-1/1-Sinx=cscx

A:

Q: find the exact value of tan(pi/8)

A:

Q: let cosx=-4/5, pi<2<3pi/2. find csc(x/2).

A: Solved below

Q: Give the exact value of sin(20).

A: