The sum of all values of \( \theta \in\left(0, \frac{\pi}{2}\right) \) satisfying
\( \sin ^{2} 2....
The sum of all values of \( \theta \in\left(0, \frac{\pi}{2}\right) \) satisfying
\( \mathrm{P} \)
\( \sin ^{2} 2 \theta+\cos ^{4} 2 \theta=\frac{3}{4} \) is
(1) \( \pi \)
(2) \( \frac{\pi}{2} \)
(3) \( \frac{5 \pi}{4} \)
(4) \( \frac{3 \pi}{8} \)
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