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secvd
@secvd
March 2021
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Merci de m’aider à résoudre cet exercice :
f est la fonction définie sur ]0 ; +∞[ par :
f(x) = x²(ln(x)-1/2).
Manon conjecture que la fonction f admet un minimum égal à -0,5
a) justifier que pour tout réel x>0, f’(x)=2xln(x).
b) étudier le signe de f’(x).
c) valider ou invalider la conjecture faite par Manon.
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