જો $y=e^{ax}(\cos bx+\sin bx)$ એ સમીકરણ $\frac{d^2y}{dx^2}-K\frac{dy}{dx}+Ly=0$ નું સમાધાન કરતું હોય, તો $L+bK=$

  • A
    $0$
  • B
    $(a+b)^2$
  • C
    $a^2-b^2$
  • D
    $a^2+b^2$

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