$x$ के सापेक्ष $\cos^{-1} \left( \sqrt{\frac{1+x}{2}} \right)$ का अवकल गुणांक क्या है?

  • A
    $-\frac{1}{2\sqrt{1-x^2}}$
  • B
    $\frac{1}{2\sqrt{1-x^2}}$
  • C
    $\frac{1}{\sqrt{1-x}}$
  • D
    $\sin^{-1} \left( \sqrt{\frac{1+x}{2}} \right)$

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

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