$\tan ^{-1}\left(\frac{1}{3}\right)+\tan ^{-1}\left(\frac{1}{5}\right)+\tan ^{-1}\left(\frac{1}{7}\right)+\tan ^{-1}\left(\frac{1}{8}\right)$ का मान है

  • A
    $\frac{\pi}{3}$
  • B
    $\frac{\pi}{12}$
  • C
    $\frac{\pi}{4}$
  • D
    $\frac{\pi}{6}$

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

यदि $x \in \left(0, \frac{1}{4}\right)$ के लिए,$\tan^{-1}\left(\frac{6x\sqrt{x}}{1-9x^3}\right)$ का अवकलज $\sqrt{x} \cdot g(x)$ है,तो $g(x)$ का मान ज्ञात कीजिए।

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