यदि $I=\int_0^{\frac{\pi}{2}} \frac{\sin ^{\frac{3}{2}} x}{\sin ^{\frac{3}{2}} x+\cos ^{\frac{3}{2}} x} d x$ है,तो $\int_0^{\frac{\pi}{2}} \frac{x \sin x \cos x}{\sin ^4 x+\cos ^4 x} d x$ का मान ज्ञात कीजिए:

  • A
    $\frac{\pi^2}{16}$
  • B
    $\frac{\pi^2}{4}$
  • C
    $\frac{\pi^2}{8}$
  • D
    $\frac{\pi^2}{12}$

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$\int_0^{\frac{\pi}{4}} \frac{\cos ^2 x}{\cos ^2 x+4 \sin ^2 x} d x=$

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