1.

If f(x) = sqrt(1-sin2x),then f'(x) is equal to

Answer»

`-(cosx+SINX), ` for `x in(pi//4, pi//2)`
`COS x + sinx,` for `x in (0,pi/4)`
`-(cosx+sinx), ` for `x in( pi//4)`
`cos x - sinx ` , for `x in (pi//4,pi//2)`

Answer :C


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