1. The problem statement, all variables and given/known data 1, Express x = 3sin3t + 5cos3t in the form of x=Rsin(3t + ø) 2, Express x = 2sin(0.5t + 3) + 3cos(0.5t + 1) in the form x = Rsin(0.5t + ø) All working must be done in radians. 2. Relevant equations Sine and Cosine Addition Formulae sin(A + B) = sinAcosB + cosAsinB cos(A + B) = cosAcosB - sinAsinB Can anyone help with this. Its driving me crazy!!