1. The problem statement, all variables and given/known data in figure shown below, a lamp load taking 6A and a single-phase motor taking 4A from 120v/60Hz source. the current to the lamp load is in phase with the voltage and the current to the motor logs 50 degrees. determine: a) value of total current IT (rms) b)angle by which current logs 6A c)angle by which total logs voltage 2. Relevant equations iT = i1+ i2 3. The attempt at a solution iT = i1+ i2 i am confused on how they get this iT =8.49(sin wt cos 40 - cos wt sin 40)+ 5.66(sinwt cos 90 - cos wt sin 90) please help ...tnx!!!