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2sin^(2)((pi//2)cos^(2)x)=1-cos(pi sin2x...

`2sin^(2)((pi//2)cos^(2)x)=1-cos(pi sin2x)` if

A

`x=(2n+1)pi//2`

B

`x=n pi//2`

C

`x=2n pi`

D

none of these, `n in I`

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The correct Answer is:
a
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