Find the derivatives of the following funtions at the indicated points:
`(1-cosx)/(1+cosx)`at `x = pi/2`

Find the derivatives of the following functions at the indicated points. (1+sinx)/(1+cosx) at x = pi/2

Find the derivatives of the following functions at the indicated points. cos(2x + pi/2) at x = pi/3

Find the derivatives of the following functions at the indicated points. cotx + sec^2 x - 5 at x = pi/6

Find the derivatives of the following functions at the indicated points. 9 sin x + si n3x at x = pi/3

Evaluate the derivative of the following function at indicated points : (1-sin x)/(1+ cos x), x=pi/2 .

Find the derivatives of the following functions at the indicated points. sqrt(sin^4x^2 +cos^4x^2) at x = (sqrt(pi/2))

Find the derivatives of the following functions at the indicated points. (cosec^2 x + tan x + cotx)^7 at x = pi/4

Find the derivative of the following function: 5secx + 4cosx

Find the derivatives of the following functions at any point of their domains: cosx^2

Find the derivative of the following function: 5sinx - 6cosx + 7