$\cos \left(\tan ^{-1}\left(\sin \left(\cot ^{-1} x\right)\right)\right)$ નું મૂલ્ય શું છે?

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

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

જો ત્રિકોણ $ABC$ માં $\angle A = 90^\circ$ હોય,તો $\tan^{-1}\left(\frac{c}{a+b}\right) + \tan^{-1}\left(\frac{b}{a+c}\right) = $

$\tan ^{-1}\left(\frac{1}{3}\right)+\tan ^{-1}\left(\frac{1}{5}\right)+\tan ^{-1}\left(\frac{1}{7}\right)+\tan ^{-1}\left(\frac{1}{8}\right)$ ની કિંમત શોધો.

જો $y = \sin^2 \left( \cot^{-1} \left( \sqrt{\frac{1-x}{1+x}} \right) \right)$ હોય,તો $\frac{dy}{dx} = $

$\cos \left[ 2\cos^{-1}\frac{1}{5} + \sin^{-1}\frac{1}{5} \right] = $

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