求f(x)=2x^3的导数及二阶,三阶,四阶,五阶导数,不只要结果,需要的是求导的过程

f'(x)=(2x³)' = 2(x³)' = 2*3x²=6x²
f''(x)=(6x²)' = 6(x²)'=6*2x =12x
f'''(x)=(12x)'=12
f(x)4阶导 = (12)'=0
f(x)5阶导 = (0)'=0
等于0是因为常数的导数为0