यदि $\cos ^{-1} \alpha+\cos ^{-1} \beta+\cos ^{-1} \gamma=3 \pi$ है,तो $\alpha(\beta+\gamma)+\beta(\gamma+\alpha)+\gamma(\alpha+\beta)$ का मान ज्ञात कीजिए।

  • A
    $0$
  • B
    $1$
  • C
    $6$
  • D
    $12$

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यदि $\tan^{-1} \frac{1}{1+1(2)} + \tan^{-1} \frac{1}{1+2(3)} + \tan^{-1} \frac{1}{1+3(4)} + \dots + \tan^{-1} \frac{1}{1+n(n+1)} = \tan^{-1} \theta$ है,तो $\theta$ =

$\cos ^{-1}\left(2 x^{2}-1\right)$ का $\cos ^{-1} x$ के सापेक्ष अवकलज क्या है?

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

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