" If "f(x)=log(tan(x)/(2))," then the value of "f'(x)" is "-

If f(x)=log_(x)(log_(e)x) , then the value of f'(e ) is -

If f(x)=log(cosx), then the value of f''(x) is-

IF f(x)=log(3x+1), then the value of f'' (1) is-

If f(x) = log _(x^(2) ) x^(3) write the value of f'(x)

If f(x)= log("tan"(x)/(2)) , then prove that, f'(x)="cosec"x .,

If f(x)=x^(4)tan(x^(3))-x ln(1+x^(2)), then the value of (d^(4)(f(x)))/(dx^(4)) at x=0 is 0(b)6(c)12 (d) 24

If f(x) = log (tan x), then f^(')(x) =

If x=log_4((2f(x))/(1-f(x))) then the value of f(2018)+f(-2017) is equal to