Solving trig equations with multiple solutions Cos (3x) + Cos (x) = Cos (2x) for x between 0 and 180

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Solving trig equations with multiple solutions Cos (3x) + Cos (x) = Cos (2x) for x between 0 and 180
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It is by taking away or subtracting Cos(2x) from both sides

mattam
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How do you get from 2Cos(2x)Cos(x) - Cos(2x) = 0 to the next step?

NightSpy
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Tell me about the exact time of the video please

mattam