1.

The value of the integral \(\displaystyle\int_0^{2\pi}\left(\dfrac{3}{9+\sin^2 \theta }\right)d\theta \) is

A. \(\dfrac{2\pi}{\sqrt{10}}\)
B. \(2\sqrt{10} \pi\)
C. \(\sqrt{10} \pi\)
D. π
Answer» B. \(2\sqrt{10} \pi\)


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