यदि $y^2 = a x^2 + 2 x + c$ है,तो $y^3 \frac{d^2 y}{d x^2}$ क्या है?

  • A
    $a c - 1$
  • B
    $a c + 1$
  • C
    $4 a c - 1$
  • D
    $a c - 4$

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