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

  • A
    $4 \sin^2 \alpha$
  • B
    $-4 \sin^2 \alpha$
  • C
    $2 \sin 2\alpha$
  • D
    $4$

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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?

यदि $\sin ^{-1}\left(\frac{3}{x}\right)+\sin ^{-1}\left(\frac{4}{x}\right)=\frac{\pi}{2}$ है, तो $x$ का मान ज्ञात कीजिए।

यदि $\sin ^{-1} x+\sin ^{-1} y=\frac{\pi}{3}$ और $\cot ^{-1}\left(\frac{1}{x}\right)-\cot ^{-1}\left(\frac{1}{y}\right)=0$ है,तो $2 x^2+y^2-x y=$

यदि $\frac{1}{2} \leq x \leq 1$ है, तो $\cos ^{-1} x+\cos ^{-1}\left(\frac{x}{2}+\frac{1}{2} \sqrt{3-3 x^2}\right)$ का मान ज्ञात कीजिए।

यदि $\sum_{n=1}^k \tan ^{-1}\left(\frac{1}{n^2+3 n+3}\right)=\tan ^{-1} \alpha$ है, तो $\alpha=$

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