The swing equation for stability of power system is represented by
1
\(M\frac{{{d^2}\delta }}{{d{t^2}}} = {P_s} + {P_e}\)
2
\(M\frac{{{d^2}\delta }}{{d{t^2}}} = {P_s} - {P_e}\)
3
\(M\frac{{{d^2}\delta }}{{d{t^2}}} = {P_s} \cdot {P_e}\)
4
None of the other options