$2{\sin ^{ - 1}}\frac{3}{5} + {\cos ^{ - 1}}\frac{{24}}{{25}} = $

  • A
    $\frac{\pi }{2}$
  • B
    $\frac{{2\pi }}{3}$
  • C
    $\frac{{5\pi }}{3}$
  • D
    इनमें से कोई नहीं

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यदि $y = \tan^{-1} \frac{x}{1+2x^2} + \tan^{-1} \frac{x}{1+6x^2} + \tan^{-1} \frac{x}{1+12x^2}$ है,तो $\left(\frac{dy}{dx}\right)_{x=\frac{1}{2}} = $

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