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misal:
u = e⁵ˣ+3
du = 5e⁵ˣ dx
subtitusi u = e⁵ˣ+3 dan dx = 1/5e⁵ˣ du :
∫ 5e⁵ˣ.(e⁵ˣ+3)⁶ dx = ∫ 5e⁵ˣ.(u)⁶ (1/5e⁵ˣ) du
= ∫ u⁶ du
= (1/7).u⁷ + C
= (1/7).(e⁵ˣ+3)⁷ + C