$\int_0^\pi x (\sin^2(\sin x) + \cos^2(\cos x)) dx = $

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

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यदि $\int_0^{\frac{\pi}{4}} \frac{\sin^2 x}{1+\sin x \cos x} dx = \frac{1}{a} \log_e\left(\frac{a}{3}\right) + \frac{\pi}{b \sqrt{3}}$,जहाँ $a, b \in N$,तो $a+b$ का मान .................... है।

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