Let \( u=\int_{0}^{\infty} \frac{d x}{x^{4}+7 x^{2}+1} \) and \( v=...
Let \( u=\int_{0}^{\infty} \frac{d x}{x^{4}+7 x^{2}+1} \) and \( v=\int_{0}^{\infty} \frac{x^{2} d x}{x^{4}+7 x^{2}+1} \).
P
The value of \( u \) is
(1) \( \pi / 3 \)
(2) \( \pi / 6 \)
(3) \( \pi / 12 \)
(4) \( \pi / 9 \)
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