$\int_0^\pi \frac{x \tan x}{\sec x+\tan x} d x$ का मान ज्ञात कीजिए।

  • A
    $\frac{\pi(\pi-2)}{2}$
  • B
    $\frac{\pi+2}{2}$
  • C
    $\frac{\pi(\pi+2)}{2}$
  • D
    $\frac{\pi-2}{2}$

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Difficult
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$\int_0^\pi x \sin x \, dx = $

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