If f(theta)=tan(sin^(-1)sqrt((2)/(3+cos2...

If `f(theta)=tan(sin^(-1)sqrt((2)/(3+cos2 theta)))` ,then:
(A) `f^(')((pi)/(4))=sqrt(2)`
(B) `f((pi)/(4))=sqrt(2)`
(C) `(d(f(theta)))/(d(cos theta))` at `theta=(pi)/(4)` is `-sqrt(2)`
(D) `(d(f(theta)))/(d(cos theta))` at `theta=(pi)/(4)` is `-2`

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