Selesaikan dengan cara integral substitusi 4xcos(x2 - 180/3)dx

InTegraL

Misal :
u = x² - π/3
du/dx = 2x
2x dx = du

∫4x cos (x² - π/3) dx
= 2 ∫ cos u . du
= 2 ∫ dsin u
= 2 sin u + C
= 2 sin (x² - π/3) + C