જો $\cos^{-1} x - \cos^{-1} \frac{y}{2} = \alpha$ હોય,તો $4x^2 - 4xy \cos \alpha + y^2$ ની કિંમત શોધો.

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

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જો $y = \sin^{-1} \left( \frac{\sqrt{1+x} + \sqrt{1-x}}{2} \right)$ હોય,તો $\frac{dy}{dx} = $

$\sin^{-1} \sqrt{\frac{x}{x+a}}$ ની કિંમત શું થાય?

જો $0 \leqslant \cos ^{-1} x \leqslant \pi$ અને $\frac{-\pi}{2} \leqslant \sin ^{-1} x \leqslant \frac{\pi}{2}$ હોય,તો $x=\frac{1}{5}$ માટે $\cos \left(2 \cos ^{-1} x+\sin ^{-1} x\right)$ ની કિંમત શોધો.

જો $\cos^{-1} x + \cos^{-1} y + \cos^{-1} z = \pi$ હોય,તો

$4 \tan^{-1} \frac{1}{5} - \tan^{-1} \frac{1}{70} + \tan^{-1} \frac{1}{99} = $

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