Ex 1: Solve a Trigonometric Equation Using a Double Angle Identity Substitution

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This video explains how to find all of the solutions of a trig equation on a given interval using a double angle identity substitution.
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What happened to the 2x from the original equation? 0:23

toomuchcamo
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Why wouldn't we distribute the 3 to cos(x) within the parenthesis?

littlebearkings
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what happened to the 6 of 6sinx cosx when its factored to 2cosx and its just +2

danielaaguirre