F(x) = (x²+1) (x³+1) maka f'(x)

U = x²+1
u' = 2x
v = x³+1
v' = 3x²

f'(x) = u'v + v'u
= (2x)(x³+1) + (3x²)(x²+1)
= 2x^4 + 2x + 3x^4 + 3x²
= 5x^4 + 3x² + 2x