Find the period, frequency, amplitude, time shift, and phase angle of the following sinusoids.

(a) \(v_{1}(t)=240 \cos (120 \pi t)-240 \sin (120 \pi t) \mathrm{V}\)

(b) \(v_{2}(t)=-30 \cos (50 \mathrm{k} \pi t)+40 \sin (50 \mathrm{k} \pi t) \mathrm{V}\)