$\cot \left( {\sum\limits_{n = 1}^{19} {{{\cot }^{ - 1}}\left( {1 + \sum\limits_{p = 1}^n {2p} } \right)} } \right)$ का मान ज्ञात कीजिए।

  • A
    $\frac{21}{19}$
  • B
    $\frac{19}{21}$
  • C
    $\frac{22}{23}$
  • D
    $\frac{23}{22}$

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यदि $y = \cot^{-1} \left( \frac{1 + \sin 5x}{\cos 5x} \right)$ है, तो $\frac{dy}{dx}$ का मान है

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यदि $\frac{1}{2} \leq x \leq 1$ है, तो $\cos ^{-1} x+\cos ^{-1}\left(\frac{x}{2}+\frac{1}{2} \sqrt{3-3 x^2}\right)$ का मान ज्ञात कीजिए।

यदि $\alpha > \beta > \gamma > 0$ है,तो व्यंजक $\cot ^{-1}\left\{\beta+\frac{(1+\beta^2)}{(\alpha-\beta)}\right\}+\cot ^{-1}\left\{\gamma+\frac{(1+\gamma^2)}{(\beta-\gamma)}\right\}+\cot ^{-1}\left\{\alpha+\frac{(1+\alpha^2)}{(\gamma-\alpha)}\right\}$ का मान क्या होगा?

यदि $y = \sec^{-1}\left( \frac{\sqrt{x} + 1}{\sqrt{x} - 1} \right) + \sin^{-1}\left( \frac{\sqrt{x} - 1}{\sqrt{x} + 1} \right)$ है,तो $\frac{dy}{dx} = $

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