- #1

Lengalicious

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## Homework Statement

Find the amplitude and phase shift of the following two superposed harmonic oscillations.

## Homework Equations

x1(t)=3sin(2∏t+∏/4)

x2(t)=3cos(2∏t)

## The Attempt at a Solution

Ok normally i would be able to do this, however one oscillation is cos and the other sin, so i can't use the trig identity for sin+sin or cos+cos. Is it possible to turn 3sin(2∏t+∏/4) into 3cos(2∏t+∏/4+∏/2) or is that invalid?