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If f(x)=sqrt(1-sin2x) , then f^(prime)(x...

If `f(x)=sqrt(1-sin2x)` , then `f^(prime)(x)` is equal to

(a)`-(cosx+sinx)`,for `x in (pi/4,pi/2)`
(b)`cosx+sinx` ,for `x in (0,pi/4)`
(c)`-(cosx+sinx)`,for `x in (0,pi/4)`
(d)`cosx-sinx` ,for `x in (pi/4,pi/2)`

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