જો $2 \tan^{-1}(\cos x) = \tan^{-1}(2 \operatorname{cosec} x)$ હોય,તો $x$ ની કિંમત શોધો.

  • A
    $\frac{\pi}{6}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{3}$
  • D
    $\frac{\pi}{12}$

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જો ${\cos ^{ - 1}}x + {\cos ^{ - 1}}y + {\cos ^{ - 1}}z = 3\pi ,$ હોય,તો $xy + yz + zx = $

સાબિત કરો કે $3 \cos ^{-1} x = \cos ^{-1} (4 x^{3} - 3 x)$,જ્યાં $x \in [\frac{1}{2}, 1]$.

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 $\cot ^{-1}(\sqrt{\cos \alpha})-\tan ^{-1}(\sqrt{\cos \alpha})=x$ હોય,તો $\sin x$ ની કિંમત શોધો.

જો $\theta = \sec^{-1}(\cosh u)$ હોય,તો $u =$

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