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

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The sum of all values of `theta in (0,pi/2)` satisfying `sin^(2)2theta+cos^(4)2theta=3/4` is
A. `pi/2`
B. `pi`
C. `(3pi)/8`
D. `(5pi)/4`
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Correct Answer - A
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