2). cos 2 x - cos 4 x = sin 6 x
cos 2 x - cos 4 x - sin 6 x = 0
( cos 2 - cos 4 - sin 6 ) x = O
x= 0
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2). cos 2 x - cos 4 x = sin 6 x
cos 2 x - cos 4 x - sin 6 x = 0
( cos 2 - cos 4 - sin 6 ) x = O
x= 0