∫ cos 3x dx
u=3x
du=3 dx
dx= du/3
∫ cos u du/3
(1/3) * ∫ cos u du
(1/3) * sen u + const
Como u =3x, temos então:
(1/3) * sen (3x) +const
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∫ cos 3x dx
u=3x
du=3 dx
dx= du/3
∫ cos u du/3
(1/3) * ∫ cos u du
(1/3) * sen u + const
Como u =3x, temos então:
(1/3) * sen (3x) +const