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The sum of all values of theta in (0,pi/...

The sum of all values of `theta in (0,pi/2)` satisfying `sin^(2)2theta+cos^(4)2theta=3/4` is

A

`pi`

B

`(pi)/(2)`

C

`(3pi)/(8)`

D

`(5pi)/(4)`

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The correct Answer is:
B
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