જો $x^2+xy+y^2=k$ હોય,તો $\frac{d^2y}{dx^2}=$

  • A
    $\frac{-6k}{(x+2y)^3}$
  • B
    $\frac{-6k}{x+2y^2}$
  • C
    $\frac{x^2+xy+y^2}{(2x+y)^2}$
  • D
    $0$

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