यदि $0 < x < \frac{1}{2}$ और $\alpha = \sin^{-1} x + \cos^{-1} \left( \frac{x}{2} + \frac{\sqrt{3 - 3 x^2}}{2} \right)$ है,तो $\tan \alpha + \cot \alpha =$

  • A
    $\frac{4}{\sqrt{3}}$
  • B
    $4 \sqrt{3}$
  • C
    $\frac{4 x}{1 - x^2}$
  • D
    $x \sqrt{1 - x^2}$

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$\sin ^{-1} \frac{12}{13}+\cos ^{-1} \frac{4}{5}+\tan ^{-1} \frac{63}{16}$ का मान क्या है?

यदि $S = \{x \in R : \sin^{-1}\left(\frac{x+1}{\sqrt{x^2+2x+2}}\right) - \sin^{-1}\left(\frac{x}{\sqrt{x^2+1}}\right) = \frac{\pi}{4}\}$,तो $\sum_{x \in S} \left(\sin\left((x^2+x+5)\frac{\pi}{2}\right) - \cos((x^2+x+5)\pi)\right)$ का मान $........$ है।

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