The value of \( \int_{a}^{a+(\pi / 2)}\left(\sin ^{4} x+\cos ^{4} x\right) d x \), is (A) \( \fr...
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0The value of \( \int_{a}^{a+(\pi / 2)}\left(\sin ^{4} x+\cos ^{4} x\right) d x \), is
(A) \( \frac{3 \pi}{8} \)
(B) \( a\left(\frac{\pi}{2}\right)^{2} \)
(C) \( \frac{3 \pi a^{2}}{8} \)
(D) none of these
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