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## Homework Statement

The displacement of a mass oscillating on a spring is given by x(t) = xmcos(ωt + ). If the initial displacement is zero and the initial velocity is in the negative x direction, then the phase constant is:

## Homework Equations

## The Attempt at a Solution

How do I start? The book just tells me that the phase constant depends on displacement and velocity when t = 0, but doesn't say how.