यदि ${\cos ^{ - 1}}x + {\cos ^{ - 1}}y + {\cos ^{ - 1}}z = 3\pi ,$ है,तो $xy + yz + zx = $

  • A
    $0$
  • B
    $1$
  • C
    $3$
  • D
    $-3$

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Similar Questions

$\cos \left[\sin ^{-1}\left(\frac{3}{5}\right)+\cos ^{-1}\left(\frac{12}{13}\right)\right]=$

यदि $\sin^{-1}(x - 2) + \cos^{-1}(x) + \tan^{-1}(x + 2) + \cot^{-1}(x + 4) = \sec^{-1}(\sqrt{k}) - \frac{\pi}{2}$ है, तो $\cos(2 \csc^{-1}\sqrt{k - 1}) = \dots$

यदि $\theta = \tan^{-1}\left(\frac{1}{3}\right) + \tan^{-1}\left(\frac{1}{7}\right) + \tan^{-1}\left(\frac{1}{13}\right) + \tan^{-1}\left(\frac{1}{21}\right) + \tan^{-1}\left(\frac{1}{31}\right)$,तो $\tan \theta =$

$2 \tan ^{-1}\left(\frac{1}{3}\right)+\tan ^{-1}\left(\frac{1}{7}\right)$ का मान ज्ञात कीजिए।

यदि किसी $x \in (-1, 1)$ के लिए $\sin^{-1} x = \frac{\pi}{5}$ है,तो $\cos^{-1} x$ का मान ज्ञात कीजिए।

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