0
Take f(x) = cos(3x)
∫ f(x) dx
= ∫ cos(3x) dx
Take u=3x → du = 3dx
= ∫ 1/3*cos(u) du
= 1/3*∫ cos(u) du
= 1/3*sin(u) + C, C ∈ ℝ
= 1/3*sin(3x) + C
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