જો $2x^2 + 3xy - y^2 + 4x - 5y + 6 = 0$ હોય, તો $(x, y) = (1, -2)$ આગળ $\frac{dy}{dx}$ ની કિંમત શોધો.

  • A
    $1$
  • B
    $-1$
  • C
    $\frac{7}{2}$
  • D
    $0$

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