bonjour
f (x) = x ¹² f ' (x) = 12 x ¹¹
f (x) = 4 x ³ - 2 x² + x - 12 f ' ( x) = 12 x² - 4 x + 1
f (x) = 2/3 x ³ + 1 /2 x - 3/4 f ' (x) = 2 x² + 1/2
f (x) = - 4 x - 12 / x f ' (x ) = - 4 - 12/x²
f (x) = ( x² + 2) / x f ' (x) = - 2 x / x²
