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f (x) = x ³ - 2 x

f ' (x) =  2 x² - 2

f (x) =   x ³ + x ²

f ' (x) =  3 x² + 2 x

f (x) =  x ³ - 5 x -  6

f '(x) =  3 x² - 5

f (x) = 3 x²

f ' (x) =  6 x

f ( x) =   5 x³

f ' (x) =   15 x²