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If f(x)=sqrt(1+cos^2(x^2)),t h e nf^(pri...

If `f(x)=sqrt(1+cos^2(x^2)),t h e nf^(prime)((sqrt(pi))/2)` is (a) `(sqrt(pi))/6` (b) `-sqrt(pi//6)` (c)`1//sqrt(6)` (d) `pi//sqrt(6)`

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