1. The problem statement, all variables and given/known data Express 3sin(ωt) + 2cos(ωt) in the form Rsin(ωt + α) AND verify the resultant function is the same frequency as 3sin(ωt) and 2cos(ωt) 2. Relevant equations R = √a2+b2 α = arctan(b/a) 3. The attempt at a solution My attempt using the equations above produces the answer R = √13 and α = 0.6 rad or 33.7° My argument for the solution being the same frequency is that the period T = 2∏/ω in each case therefore f = 1/T = ω/2∏ I have my doubts about this solution because I believe the marks are awarded for a solution involving the double and compound angle formula (I cant see how this is necessary). Also, is the statement regarding frequency comprehensive enough or is there a better way of presenting the solution?