यदि $x>0, y>0, z>0, xy+yz+zx < 1$ और यदि $\tan^{-1} x + \tan^{-1} y + \tan^{-1} z = \pi$ है, तो $x+y+z$ का मान क्या होगा?

  • A
    $0$
  • B
    $xyz$
  • C
    $3xyz$
  • D
    $\sqrt{xyz}$

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मान ज्ञात कीजिए: $\cos^{-1}(\cos \frac{4\pi}{3}) + \sin^{-1}(\sin \frac{4\pi}{3}) = \dots$

यदि $y = \cos^2 [\cot^{-1} (\sqrt{\frac{1-x}{1+x}})]$ है, तो $\frac{dy}{dx} = \dots$

यदि $\sin \left(\sin ^{-1} \frac{1}{5}+\cos ^{-1} x\right)=1$ है,तो $x$ का मान ज्ञात कीजिए।

$\cot ^{-1}\left(\frac{1}{\sqrt{x^2-1}}\right)=$ . . . . . . जहाँ,$x>1$.

यदि $\tan^{-1}(1) + \tan^{-1}(3) + \tan^{-1}(5) + \tan^{-1}(1/4) = \pi + \tan^{-1}(\alpha/2)$ है, तो $\alpha$ का मान है... ($/41$ में)

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