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= -(1/3).cos 3x - ∫ (sin x/cos x) dx ; misal: u = cos x
du = -sin x dx
= -(1/3).cos 3x + ∫ 1/u du
= -(1/3).cos 3x + ln u + C
= -(1/3).cos 3x + ln (cos x) + C