જો $\theta = \cot^{-1}(7) + \cot^{-1}(8) + \cot^{-1}(18)$ હોય,તો $\cot \theta$ ની કિંમત શોધો.

  • A
    $2$
  • B
    $3$
  • C
    $4$
  • D
    $1$

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જો $f(x) = \tan^{-1}\left\{ \frac{\log(e/x^2)}{\log(ex^2)} \right\} + \tan^{-1}\left( \frac{3 + 2\log x}{1 - 6\log x} \right)$ હોય,તો $\frac{d^n y}{dx^n}$ શું થાય? $(n \ge 1)$

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વિધાન $I:$ સમીકરણ $(\sin^{-1} x)^3 + (\cos^{-1} x)^3 - a\pi^3 = 0$ નો ઉકેલ તમામ $a \ge \frac{1}{32}$ માટે મળે છે.
વિધાન $II:$ કોઈપણ $x \in [-1, 1]$ માટે,$\sin^{-1} x + \cos^{-1} x = \frac{\pi}{2}$ અને $0 \le (\sin^{-1} x - \frac{\pi}{4})^2 \le \frac{9\pi^2}{16}$ છે.

જો ${({\tan ^{ - 1}}x)^2} + {({\cot ^{ - 1}}x)^2} = \frac{{5{\pi ^2}}}{8}$ હોય,તો $x$ ની કિંમત શોધો.

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