tentukan integral 4 cos (3x-3)dx

InTegraL

misal :
u = 3x - 3
du/dx = 3
dx = 1/3 du

∫4cos (3x - 3) dx
= 4 ∫cos u . 1/3 du
= 4/3 ∫dsin u
= 4/3 sin u + C
= 4/3 sin (3x - 3) + C