જો $y = \sqrt{x^2 + 8x + 3}$ હોય, તો $x = 3$ આગળ $\frac{d^2y}{dx^2}$ નું મૂલ્ય છે

  • A
    $\frac{-13}{216}$
  • B
    $\frac{13}{216}$
  • C
    $\frac{15}{216}$
  • D
    $\frac{-15}{216}$

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