A. f is differentiable everywhere

B. f is not differentiable everywhere

C. f is not differentiable at x=1

D. f is not differentiable everywhere

The derivative of (log x)^{x}w.r.to x is

The derivative of cot^{-1}(cosec x-cot x) w.r.to x is

If (y=1/1+x+x^{2}+x^{3}) then y_{2}(0)=

The derivative of √(tan x+√tan x) w.r.t x is

d/dx{sin x/ 1+ cos x}=