यदि $\theta = \cot^{-1}(7) + \cot^{-1}(8) + \cot^{-1}(18)$ है,तो $\cot \theta$ का मान ज्ञात कीजिए।

  • A
    $2$
  • B
    $3$
  • C
    $4$
  • D
    $1$

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सिद्ध कीजिए कि $\sin ^{-1}(2 x \sqrt{1-x^{2}})=2 \cos ^{-1} x$,जहाँ $\frac{1}{\sqrt{2}} \leq x \leq 1$.

${\sin ^{ - 1}}\frac{4}{5} + 2{\tan ^{ - 1}}\frac{1}{3} = $

$\cot ^{ - 1}\left[ \frac{\sqrt {1 - \sin x} + \sqrt {1 + \sin x}}{\sqrt {1 - \sin x} - \sqrt {1 + \sin x}} \right] = $

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

समीकरण $2\cos^{-1}x + \sin^{-1}x = \frac{11\pi}{6}$ के

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