solve for a and b, (-2*e^(-7x)*sin(4x))''+a*(-2*e^(-7x)*sin(4x))'+b*(-2*e^(-7x)*sin(4x))=0solve for a and b, (-2*e^(-7x)*sin(4x))''+a*(-2*e^(-7x)*sin(4x))'+b*(-2*e^(-7x)*sin(4x))=0

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