If \( x \in\left[-\frac{5 \pi}{2}, \frac{5 \pi}{2}\right] \), then the greatest positive solutio....
If \( x \in\left[-\frac{5 \pi}{2}, \frac{5 \pi}{2}\right] \), then the greatest positive solution
\( \mathrm{P} \)
of \( 1+\sin ^{4} x=\cos ^{2} 3 x \) is-
(1) \( \pi \)
(2) \( 2 \pi \)
(3) \( \frac{5 \pi}{2} \)
(4) \( \frac{3 \pi}{2} \)
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