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menggunakan y = u.v → y' = u'v + v'u
u=2x → u'=2
v= sin³(3x-1) → w= sin (3x-1) ; w'= 3 cos (3x-1)
sehingga v=w³ → v'= 3 w' w²
v' = 3* 3 cos (3x-1) * sin²(3x-1)
v'= 9 cos (3x-1) * sin²(3x-1)
jadi
f'(x) = y' = u'v + v'u
f'(x)= 2 sin³(3x-1) + 18x cos (3x-1) sin²(3x-1)