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)/(8)`

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The correct Answer is:

B

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