જો $0 < x < 1$ અને $\tan ^{-1}(1-x), \tan ^{-1} x$ તથા $\tan ^{-1}(1+x)$ સમાંતર શ્રેણી ($A$.$P$.) માં હોય,તો $x^3$ ની કિંમત : . . . . . . થાય.

  • A
    $x^2-1$
  • B
    $1+x^2$
  • C
    $1-x^2$
  • D
    $x^2$

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જો $\cot^{-1}[(\cos \alpha)^{1/2}] - \tan^{-1}[(\cos \alpha)^{1/2}] = x$ હોય,તો $\sin x = $

જો કોઈ $x \in (-1, 1)$ માટે $\sin^{-1} x = \frac{\pi}{5}$ હોય,તો $\cos^{-1} x$ ની કિંમત શોધો.

ધારો કે $S$ એ સમીકરણ $\cos ^{-1}(2 x)-2 \cos ^{-1}\left(\sqrt{1-x^2}\right)=\pi$ ના તમામ ઉકેલોનો ગણ છે,જ્યાં $x \in\left[-\frac{1}{2}, \frac{1}{2}\right]$. તો $\sum_{x \in S} 2 \sin ^{-1}\left(x^2-1\right)$ ની કિંમત શોધો.

$\sin ^{-1} \frac{\sqrt{3}}{2} + \sin ^{-1} \sqrt{\frac{2}{3}} = $

જો $\theta = \tan^{-1}\left(\frac{1}{3}\right) + \tan^{-1}\left(\frac{1}{7}\right) + \tan^{-1}\left(\frac{1}{13}\right) + \tan^{-1}\left(\frac{1}{21}\right) + \tan^{-1}\left(\frac{1}{31}\right)$,તો $\tan \theta =$

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