Question: Find all errors in the following: 2 sin 2 2x + cos 4x = 2(2 sin x cos x) 2 + 2 cos 2x =

Find all errors in the following:

2 sin2 2x + cos 4x

= 2(2 sin x cos x)2 + 2 cos 2x

= 8 sin2 x cos2 x + 2(cos2 x + sin2 x)

= 8 sin2 x cos2 x + 2.

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