문제 풀이

f '(x) = (3x² - 1)(2x² + 4x + 2)' + (3x² - 1)'(2x² + 4x + 2)

= (3x² - 1)(4x + 4) + 6x(2x² + 4x + 2)

= (12x³ + 12x² - 4x - 4) + (12x³ + 24x² + 12x)

= 24x³ + 36x² + 8x - 4