यदि \( P=\int_{0}^{3 \pi} f\left(\cos ^{2} x\right) d x \) तथा \( Q=\int_{0}^{\pi} f\left(\cos ^...
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यदि \( P=\int_{0}^{3 \pi} f\left(\cos ^{2} x\right) d x \) तथा \( Q=\int_{0}^{\pi} f\left(\cos ^{2} x\right) d x \), तब
(A) \( P-Q=0 \)
(B) \( P-2 Q=0 \)
(C) \( P-3 Q=0 \)
(D) \( P-5 Q=0 \)
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