मूल्यांकन करें: $\tan ^{ - 1}\left(\frac{{{c_1}x - y}}{{{c_1}y + x}}\right) + \tan ^{ - 1}\left(\frac{{{c_2} - {c_1}}}{{1 + {c_2}{c_1}}}\right) + \tan ^{ - 1}\left(\frac{{{c_3} - {c_2}}}{{1 + {c_3}{c_2}}}\right) + ... + \tan ^{ - 1}\left(\frac{1}{{{c_n}}}\right)$

  • A
    $\tan ^{ - 1}\left(\frac{y}{x}\right)$
  • B
    $\tan ^{ - 1}(yx)$
  • C
    $\tan ^{ - 1}\left(\frac{x}{y}\right)$
  • D
    $\tan ^{ - 1}(x - y)$

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$2{\tan ^{ - 1}}\left[ {\sqrt {\frac{{a - b}}{{a + b}}} \tan \frac{\theta }{2}} \right] = $

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यदि $\tan ^{-1} x+\tan ^{-1} y+\tan ^{-1} z=\frac{\pi}{2}$ है,तो $1-x y-y z-z x$ का मान ज्ञात कीजिए।

यदि $\frac{\sin ^{-1} x}{a}=\frac{\cos ^{-1} x}{b}=\frac{\tan ^{-1} y}{c}$ और $0 < x < 1$ है,तो $\cos \left(\frac{\pi c}{a + b}\right)$ का मान ज्ञात कीजिए।

समीकरण $\tan ^{-1} x+\tan ^{-1} 2 x=\frac{\pi}{4}$ को संतुष्ट करने वाला $x$ का वास्तविक मान है

यदि $\tan ^{-1} 2x + \tan ^{-1} 3x = \frac{\pi}{4}$ है,तो $x = $

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