यदि $\cos ^{-1} x - \cos ^{-1} \frac{y}{2} = \alpha$,जहाँ $-1 \leq x \leq 1, -2 \leq y \leq 2, x \leq \frac{y}{2}$ है,तो सभी $x, y$ के लिए $4x^2 - 4xy \cos \alpha + y^2$ का मान क्या होगा?

  • A
    $2 \sin ^2 \alpha$
  • B
    $4 \sin ^2 \alpha$
  • C
    $4 \cos ^2 \alpha + 2x^2y^2$
  • D
    $4 \sin ^2 \alpha - 2x^2y^2$

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यदि $y = \sec^{-1}\left( \frac{x + 1}{x - 1} \right) + \sin^{-1}\left( \frac{x - 1}{x + 1} \right)$ है,तो $\frac{dy}{dx} = $

यदि $\tan ^{-1}\left(\frac{1-x}{1+x}\right)-\frac{1}{2} \tan ^{-1} x=0$,$x>0$ के लिए,तो $x=$

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