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**1. Homework Statement**

A pendulum's angle is given by (.10 rad)cos(5t + pi)

where t is in sec. What is the initial angle?

**2. Homework Equations**

**3. The Attempt at a Solution**

Do I plug in t= 0 to get this angle, or is the phase constant this angle? I read that the phase constant specifies initial conditions, but I'm not entirely clear on what it means.