The value of the integral $\int_{0}^{\pi} x \cos ^{2} x d x$ is

(A) $\pi^{2} / 8$

(B) $\pi^{2} / 4$

(C) $\pi^{2} / 2$

(D) $\pi^{2}$

The value of the integral $\int_{0}^{\pi} x \cos ^{2} x d x$ is

(A) $\pi^{2} / 8$

(B) $\pi^{2} / 4$

(C) $\pi^{2} / 2$

(D) $\pi^{2}$

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