વિકલન શોધો: $\frac{d}{dx} \cos^{-1} \left( \frac{x - x^{-1}}{x + x^{-1}} \right)$

  • A
    $\frac{1}{1 + x^2}$
  • B
    $\frac{-1}{1 + x^2}$
  • C
    $\frac{2}{1 + x^2}$
  • D
    $\frac{-2}{1 + x^2}$

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જો $\alpha$ અને $\beta$ પ્રથમ ચરણમાં એવા ખૂણાઓ હોય કે જેથી $\tan \alpha = \frac{1}{7}$ અને $\sin \beta = \frac{1}{\sqrt{10}}$,તો $\alpha + 2\beta =$ ($^{\circ}$ માં)

$\cos ^{-1}\left\{\frac{1}{\sqrt{2}}\left(\cos \frac{9 \pi}{10}-\sin \frac{9 \pi}{10}\right)\right\}$ નું મૂલ્ય શોધો.

$x > 0$ માટે $\tan ^{-1} \frac{1-x}{1+x}=\frac{1}{2} \tan ^{-1} x$ ઉકેલો.

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${\tan ^{ - 1}}\left( \frac{{2x}}{{1 - {x^2}}} \right)$ નું ${\sin ^{ - 1}}\left( \frac{{2x}}{{1 + {x^2}}} \right)$ ની સાપેક્ષ વિકલન સહગુણક શોધો.

$\cot ^{ - 1}\left[ \frac{\sqrt {1 - \sin x} + \sqrt {1 + \sin x}}{\sqrt {1 - \sin x} - \sqrt {1 + \sin x}} \right] = $

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