જો $\cos (2\sin ^{ - 1}x) = \frac{1}{9}$ હોય,તો $x = $

  • A
    માત્ર $\frac{2}{3}$
  • B
    માત્ર $-\frac{2}{3}$
  • C
    $\frac{2}{3}, -\frac{2}{3}$
  • D
    $\frac{2}{3}$ કે $-\frac{2}{3}$ બંનેમાંથી એક પણ નહીં

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$\sin [\cot ^{ - 1}(\cos \tan ^{ - 1}x)] =$

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

$x=\frac{1}{5}$ હોય ત્યારે $\cos \left(2 \cos ^{-1} x+\sin ^{-1} x\right)$ ની કિંમત શોધો,જ્યાં $0 \leq \cos ^{-1} x \leq \pi$ અને $-\frac{\pi}{2} \leq \sin ^{-1} x \leq \frac{\pi}{2}$ છે.

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