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## Homework Statement

The position of a an air-track cart that is oscillating on a spring is given by (12.5cm)cos[(18.0s-1)t].

At what value t after t=0 is the cart first located at x=12.2 cm?

## The Attempt at a Solution

12.2 cm = (12.5cm)cos[(18.0s^-1)t].

How do I factor t out?

Thanks