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cos 2x = 2cos²x - 1
Maka:
Int (4cos²x - 2) dx
= Int 2(2cos²x-1) dx
= Int 2cos(2x) dx
Mengingat Integral dari cos(2x) adalah 1/2 sin(2x)
Maka,
= 2 (1/2 sin(2x)) + C
= sin(2x) + C [E]