Find the derivatives of the following funtions at the indicated points:
`cot x + sec^2 x - 15 `at `x = pi/6`

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. cos(2x + pi/2) at x = pi/3

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

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

Find the derivatives of the following function : f(x) =pi .

Find the derivatives of the following : cosec x cot x.

Find the derivatives of the following : x^5 cot x .

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