F'(x) = 1/2Vx
il faut 1/2vx = 1/6 => 2Vx = 6 => vx = 3 => x = 9
f(9) = 3
T ≡ y - 3 = 1/6(x-9) => y = 1/6x - 3/2 + 3 => y = 1/6x + 3/2
la droite est tangente à Cf au point x = 9
Bonne soirée
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F'(x) = 1/2Vx
il faut 1/2vx = 1/6 => 2Vx = 6 => vx = 3 => x = 9
f(9) = 3
T ≡ y - 3 = 1/6(x-9) => y = 1/6x - 3/2 + 3 => y = 1/6x + 3/2
la droite est tangente à Cf au point x = 9
Bonne soirée