turunan fungsi trigonometri f(x)=cos(x²-5x)

u = x² - 5x
f'(x) = d(cos u)/du . d(x² - 5x)/dx
= -sinu . (2x - 5)
= -(2x - 5) sin(x² - 5x), atau
= (5 - 2x) sin(x² - 5x)