જો $\sec^{-1} \left( \frac{x^2 + y^2}{x^2 - y^2} \right) = 2a$, એ રીતે કે $y \frac{dy}{dx} = x \cdot f(a)$, તો $f \left( \frac{2\pi}{3} \right)$ ની કિંમત શોધો

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

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