Let f(x)= int(sin x)^(cos x) e^(-t^(2)) ...

Let `f(x)= int_(sin x)^(cos x) e^(-t^(2)) dt`. Then `f'((pi)/(4))` equals

A

`sqrt(""^(1)//e)`

B

`- sqrt(""^(2)//e)`

C

`sqrt(""^(2)//e)`

D

`- sqrt(""^(1)//e)`

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