यदि $\cos^{-1} \left( \frac{x}{2} \right) + \cos^{-1} \left( \frac{y}{3} \right) = \theta$ है,तो $9 x^{2} - 12 x y \cos \theta + 4 y^{2} =$ क्या होगा?

  • A
    $36 \sin^{2} \theta$
  • B
    $37 \sin^{2} \theta$
  • C
    $39 \sin^{2} \theta$
  • D
    $36 \cos^{2} \theta$

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सिद्ध कीजिए कि $\cot ^{-1}\left(\frac{\sqrt{1+\sin x}+\sqrt{1-\sin x}}{\sqrt{1+\sin x}-\sqrt{1-\sin x}}\right)=\frac{x}{2}$,जहाँ $x \in\left(0, \frac{\pi}{4}\right)$.

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