Q^2 - 125 = 0
q^2 = 125
q = +/- sqrt 125 = 11.18, -11.18

On the unit cirlce, the cosine of an angle is negative whenever the angle falls in the interval

.
If you recall your special triangles, this cosine occurs for angles of

and

.
More generally, this occurs for

and

, where

is an integer.
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