If `f(x)=cos^(-1)[(1-(logx)^2)/(1+(logx)^2)]` , then the value of `f'(e)` is equal to........

If f(x)=log_x(logx) then the value of f'(e) is

IF f(x)= log_x(logx) then the value of f'(e) is

If A=[(logx,-1),(-logx,2)] and if det (A) = 2, then the value of x is equal to

f(x)=cos(logx) , then

f(x)=cos(logx) , then

If f(x)=log_x^(2)(logx) , then f(e)

If f(x)=(log)_x(logx) , then f'(x) at x=e is equal to......

If f(x)=tan^(-1)[(log((e)/(x^(2))))/(log(ex^(2)))]+tan^(-1)[(3+2logx)/(1-6logx)] then the value of f''(x) is