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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 `-(cosx+sinx),forx in (pi/4,pi/2)` `cosx+sinx ,forx in (0,pi/4)` `-(cosx+sinx),forx in (0,pi/4)` `cosx-sinx ,forx in (pi/4,pi/2)`

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