Calculate the instantaneous power of a single-phase power system that its voltage and current are \(v(t)=\) \(110 \sqrt{2} \cos (120 \pi t) V\) and \(i(t)=2 \sqrt{2} \cos \left(120 \pi t-60^{\circ}ight) A\).

1) \(110 \mathrm{~W}\)

2) \(220 \cos \left(240 \pi t-60^{\circ}ight) \mathrm{W}\)

3) \(55+110 \cos \left(240 \pi t-60^{\circ}ight) \mathrm{W}\)

4) \(110+220 \cos \left(240 \pi t-60^{\circ}ight) \mathrm{W}\)