यदि $0 < x < \frac{1}{\sqrt{2}}$ और $\frac{\sin ^{-1} x}{\alpha}=\frac{\cos ^{-1} x}{\beta}$ है,तो $\sin \left(\frac{2 \pi \alpha}{\alpha+\beta}\right)$ का मान $......$ है।

  • A
    $4 \sqrt{1-x^{2}}(1-2 x^{2})$
  • B
    $4 x \sqrt{1-x^{2}}(1-2 x^{2})$
  • C
    $2 x \sqrt{1-x^{2}}(1-4 x^{2})$
  • D
    $4 \sqrt{1-x^{2}}(1-4 x^{2})$

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यदि $\alpha \leq 2 \sin^{-1} x + \cos^{-1} x \leq \beta$ है,तो

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 $\tan ^{-1}(2 x)+\tan ^{-1}(3 x)=\frac{\pi}{4}$,जहाँ $x>0$,तो $x=$

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