C.E
[tex] \left \{ {{4- x^{2} \geq 0 } \atop {2x-1 \geq 0 }} \right. [/tex]
[tex] x^{2} -4=0[/tex]
[tex] x^{2} =4[/tex]⇒[tex] x_{1,2} [/tex] =+2,-2
tabel de variatie x| -∞......-2......2.... +∞
x^2-4| +++-0------0++++
⇒x∈(-∞,-2] u [2,+∞)
2x-1≥0 ⇒2x=1
x=[tex] \frac{1}{2} [/tex]
x∈(+∞,[tex] \frac{1}{2} [/tex]]
