2) Two voltage sources are connected to a circuit. At time t milliseconds, the voltage from source A is Va(t) = 10 cos (30t) volts and the voltage from source B is Vo(t) = 15 cos (30t + 5) volts. a) Write, in the form V(t) = A cos (30t + B), an expression for the total voltage in the circuit at time t milliseconds. b) Hence, find the highest voltage in the circuit. 4341 [6]