If \( \int_{0}^{n \pi} f\left(\cos ^{2} x\right) d x=k \int_{0}^{\pi} f\left(\cos ^{2} x\right) ... VIDEO
If \( \int_{0}^{n \pi} f\left(\cos ^{2} x\right) d x=k \int_{0}^{\pi} f\left(\cos ^{2} x\right) d x \), then the value of \( k \), is
(A) 1
(B) \( n \)
(C) \( n / 2 \)
(D) none of these
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