$\frac{d}{dx} \left( \cos^{-1} \sqrt{\frac{1 + \cos x}{2}} \right) = $

  • A
    $1$
  • B
    $\frac{1}{2}$
  • C
    $\frac{1}{3}$
  • D
    આમાંથી કોઈ નહીં

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જો $\sin^{-1} x + \sin^{-1} y + \sin^{-1} z = \frac{\pi}{2}$ હોય,તો $x^2 + y^2 + z^2 + 2xyz$ ની કિંમત કેટલી થાય?

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) = $

$\tan \left(2 \tan ^{-1}\left(\frac{\sqrt{5}-1}{2}\right)\right)$ નું મૂલ્ય શોધો.

$\tan ^{-1}\left[\frac{1}{\sqrt{3}} \sin \frac{5 \pi}{2}\right] + \sin ^{-1}\left[\cos \left(\sin ^{-1} \frac{\sqrt{3}}{2}\right)\right]$ ની કિંમત શોધો.

સાબિત કરો કે $\cot ^{-1}\left(\frac{\sqrt{1+\sin x}+\sqrt{1-\sin x}}{\sqrt{1+\sin x}-\sqrt{1-\sin x}}\right)=\frac{x}{2}$,જ્યાં $x \in\left(0, \frac{\pi}{4}\right)$.

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