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Evaluate: `int_(pi//4)^(pi//2)sqrt(1-sin2x)dx`

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Evaluate: `int_(pi//4)^(pi//2)sqrt(1-sin2x)dx`
A. `cos x +sinx`
B. `-(cosx+sinx)`
C. `pm(cosx+sinx)`
D. None of these
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Correct Answer - A
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