यदि $I_n = \int_0^{\pi / 2} \sin^n(x) dx$ और $I_n = (k) I_{n-2}$ है,तो $k$ का मान क्या होगा?

  • A
    $\frac{n}{n-1}$
  • B
    $\frac{n-1}{n}$
  • C
    $\frac{n+1}{n}$
  • D
    $\frac{n}{n+1}$

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निश्चित समाकलन $\int_{\frac{\pi}{6}}^{\frac{\pi}{3}} \frac{d x}{1+\sqrt{\tan x}}$ का मान ज्ञात कीजिए।

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$\int_0^\pi \frac{x \tan x}{\sec x + \cos x} \,dx = $

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