03 generalitesfonction Med ELBOUCHAIRI

f Df
f
Df
(∀x∈Df); −x∈Df
(∀x∈Df); f(−x) = f(x)

cos
x7→ x2nn∈N
g:x7→ |x−1|+|x+ 1|
f x
f(x) = 3x2+ 2
x2−4
f
Df={x∈R;x2−46= 0}=R− {−2; 2}
Df0
x∈Dff(−x) = 3(−x)2+ 2
(−x)2−4=3x2+ 2 x2−4=f(x)
f