જો $(\sin ^{-1} x)^{2}-(\cos ^{-1} x)^{2}=a ; 0 < x < 1, a \neq 0$ હોય,તો $2 x^{2}-1$ ની કિંમત શું થાય?

  • A
    $\cos \left(\frac{4 a}{\pi}\right)$
  • B
    $\sin \left(\frac{2 a}{\pi}\right)$
  • C
    $\cos \left(\frac{2 a}{\pi}\right)$
  • D
    $\sin \left(\frac{4 a}{\pi}\right)$

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જો $x = {\sin ^{ - 1}}(\sin 10)$ અને $y = {\cos ^{ - 1}}(\cos 10)$ હોય,તો $y - x$ ની કિંમત શોધો.

જો $\cot ^{-1}(\alpha)=\cot ^{-1} 2+\cot ^{-1} 8+\cot ^{-1} 18+\cot ^{-1} 32+\ldots$ $100$ પદો સુધી હોય,તો $\alpha$ ની કિંમત શોધો.

$\sin(3 \sin^{-1}(1/5))$ ની કિંમત શોધો.

$\tan \left[ {\frac{1}{2}{{\sin }^{ - 1}}\left( {\frac{{2a}}{{1 + {a^2}}}} \right) + \frac{1}{2}{{\cos }^{ - 1}}\left( {\frac{{1 - {a^2}}}{{1 + {a^2}}}} \right)} \right] = $

$\cos ^{-1}\left(2 x^{2}-1\right)$ નું $\cos ^{-1} x$ ની સાપેક્ષમાં વિકલન શું થાય?

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