The voltage of an AC electrical source can be modelled by the equation V = a sin(bt + c), where a is the maximum voltage (amplitude). Two AC sources are combined, one with a maximum voltage of 40V and the other with a maximum voltage of 20V. a. Write 40 sin (0.125t-1) +20 sin(0.125t + 5) in the form A sin(0.125t + B), where A > 0,-