The largest positive solution of \( 1+\sin ^{4} x=\cos ^{2} 3 x \) in \( [-5 \pi / 2,5 \pi / 2] ...
The largest positive solution of \( 1+\sin ^{4} x=\cos ^{2} 3 x \) in \( [-5 \pi / 2,5 \pi / 2] \), is
(A) \( \pi \)
(B) \( 2 \pi \)
(C) \( \frac{5 \pi}{2} \)
(D) none of these
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