$x=\frac{1}{5}$ હોય ત્યારે $\cos \left(2 \cos ^{-1} x+\sin ^{-1} x\right)$ ની કિંમત શોધો,જ્યાં $0 \leq \cos ^{-1} x \leq \pi$ અને $-\frac{\pi}{2} \leq \sin ^{-1} x \leq \frac{\pi}{2}$ છે.

  • A
    $\frac{\sqrt{6}}{5}$
  • B
    $-\frac{\sqrt{6}}{5}$
  • C
    $\frac{2 \sqrt{6}}{5}$
  • D
    $-\frac{2 \sqrt{6}}{5}$

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સાબિત કરો કે $\tan ^{-1} x+\tan ^{-1} \frac{2 x}{1-x^{2}}=\tan ^{-1}\left(\frac{3 x-x^{3}}{1-3 x^{2}}\right)$,જ્યાં $|x| < \frac{1}{\sqrt{3}}$.

ધારો કે $f(\theta) = \sin ( \tan ^{-1} ( \frac{\sin \theta}{\sqrt{\cos 2 \theta}} ) )$,જ્યાં $-\frac{\pi}{4} < \theta < \frac{\pi}{4}$,તો $\frac{d}{d(\tan \theta)}(f(\theta))$ નું મૂલ્ય શોધો.

$\lim _{x \rightarrow 0^{+}} \frac{x \sin ^{-1}\left(\frac{2 x}{1+x^2}\right)}{\cos ^{-1}\left(\frac{1-x^2}{1+x^2}\right) \tan ^{-1}\left(\frac{3 x-x^3}{1-3 x^2}\right)}$ ની કિંમત શોધો.

જો ${x^2} + {y^2} + {z^2} = {r^2}$ હોય,તો ${\tan ^{ - 1}}\left( {\frac{{xy}}{{zr}}} \right) + {\tan ^{ - 1}}\left( {\frac{{yz}}{{xr}}} \right) + {\tan ^{ - 1}}\left( {\frac{{zx}}{{yr}}} \right) = $

$\tan \left(2 \tan ^{-1} \frac{1}{5} + \sec ^{-1} \frac{\sqrt{5}}{2} + 2 \tan ^{-1} \frac{1}{8}\right)$ ની કિંમત શોધો.

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