$\cos ^{-1}\left[\frac{1}{\sqrt{2}}\left(\cos \frac{9 \pi}{10}-\sin \frac{9 \pi}{10}\right)\right]$ का मुख्य मान ज्ञात कीजिए।

  • A
    $\frac{3 \pi}{20}$
  • B
    $\frac{17 \pi}{20}$
  • C
    $\frac{7 \pi}{10}$
  • D
    $\frac{\pi}{10}$

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Similar Questions

सिद्ध कीजिए कि $\tan ^{-1} x+\tan ^{-1} \frac{2 x}{1-x^{2}}=\tan ^{-1}\left(\frac{3 x-x^{3}}{1-3 x^{2}}\right)$,जहाँ $|x| < \frac{1}{\sqrt{3}}$.

समीकरण $\tan^{-1}(1 + x) + \tan^{-1}(1 - x) = \frac{\pi}{2}$ का एक हल है

यदि $\tan^{-1} x + \tan^{-1} y = \frac{\pi}{4}$ है,तो:

मान ज्ञात कीजिए: ${\tan ^{ - 1}}\left[ {\frac{{\cos x}}{{1 + \sin x}}} \right]$

यदि $x \geq 1$ है,तो $2 \tan^{-1} x + \sin^{-1} (\frac{2x}{1+x^2})$ का मान क्या होगा?

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