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## Homework Statement

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.

## Homework 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!!