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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$\frac{d}{dx}(\sin^{-1}(3x - 4x^3)) = $

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यदि $\log_{\pi}x > 0$,तो $\log_{\pi}\left( \sin^{-1}\frac{2x}{1+x^2} + 2\tan^{-1}x \right)$ का मान किसके बराबर है?

यदि $(\tan ^{-1} x)^2+(\cot ^{-1} x)^2=\frac{5 \pi^2}{8}$ है,तो $x$ का मान ज्ञात कीजिए।

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