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## Homework Statement

A 15-centimeter pendulum moves according to the equation:

**theta**=0.2cos8t

where

**theta**is the angular displacement from the vertical in radians and t is the time in seconds. Determine the maximum angular displacement and the rate of change of

**theta**when t=3 seconds.

## Homework Equations

See, here's where I get stuck. It doesn't seem like I'm given enough information to do ANYTHING with this problem. At first I thought I could find the absolute maximum value by solving for

**theta**at the endpoints and critical numbers, but I don't have any endpoints. Any physics equations I could use go out the window as well, because I have no initial displacement or velocity or any such stuff.

## The Attempt at a Solution

Insert an hour of frustrated grumbling here, with no results.