$\int_0^\pi \frac{x \sin x}{1+\cos ^2 x} d x=$

  • A
    $\frac{\pi^2}{4}$
  • B
    $\frac{\pi}{2}$
  • C
    $\frac{\pi^2}{2}$
  • D
    $\frac{\pi}{4}$

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ધારો કે $g_i: \left[\frac{\pi}{8}, \frac{3\pi}{8}\right] \rightarrow \mathbb{R}, i=1, 2$,અને $f: \left[\frac{\pi}{8}, \frac{3\pi}{8}\right] \rightarrow \mathbb{R}$ એવા વિધેયો છે કે જેથી $g_1(x)=1, g_2(x)=|4x-\pi|$ અને $f(x)=\sin^2 x$,દરેક $x \in \left[\frac{\pi}{8}, \frac{3\pi}{8}\right]$ માટે.
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