$\cot ^{-1}\left[\frac{\sqrt{1-\sin x}+\sqrt{1+\sin x}}{\sqrt{1-\sin x}-\sqrt{1+\sin x}}\right]$ का मान ज्ञात कीजिए,जहाँ $x \in\left(0, \frac{\pi}{4}\right)$ है।

  • A
    $\frac{x}{2}-\pi$
  • B
    $\pi-\frac{x}{3}$
  • C
    $\pi-\frac{x}{2}$
  • D
    $\frac{x}{2}$

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$\tan ^{-1} x+2 \cot ^{-1} x=\frac{2 \pi}{3}$ का हल है

यदि $\sin ^{-1}\left(\frac{2 a}{1+a^2}\right)+\cos ^{-1}\left(\frac{1-a^2}{1+a^2}\right)=\tan ^{-1}\left(\frac{2 x}{1-x^2}\right)$ जहाँ $a, x \in(0,1)$,तो $x$ का मान ज्ञात कीजिए।

यदि $\tan ^{-1}\left[\frac{1}{1+1 \cdot 2}\right]+\tan ^{-1}\left[\frac{1}{1+2 \cdot 3}\right]+\cdots+\tan ^{-1}\left[\frac{1}{1+n(n+1)}\right]=\tan ^{-1}[x]$ है,तो $x=$

यदि $\cos^{-1} x - \cos^{-1} \frac{y}{2} = \alpha$ है,तो $4x^2 - 4xy \cos \alpha + y^2$ का मान ज्ञात कीजिए।

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