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(Solved): evaluate the trig function cos(2), if cos=1/5 and is in Quadrant 1. ...

evaluate the trig function

$\( \cos (2 \theta) \), if \( \cos \theta=1 / 5 \) and \( \theta \) is in Quadrant 1.$

cos (2 θ)

, if

cos θ = 1/5

and

θ

is in Quadrant 1.

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