bila y=x^2 sin 3x,maka dy/dx.....

u = x² → u' = 2x
v = sin(3x) → v' = 3 cos(3x)
dy/dx = u'v + v'u
= 2x sin(3x) + 3 cos(3x) x²
= 2x sin(3x) + 3x² cos(3x)

atau dlm bntuk lain...