pleaseee, am nevoie de ajutor ><
Fie [tex]A=\left[\begin{array}{ccc}a_{11} &a_{12}\\a_{21}&a_{22}\\\end{array}\right][/tex]

Aratati ca are loc egalitatea

A²-tr(A)*A+ det(A)* I₂=O₂

unde:
tr(A)=a₁₁+a₂₂
det(a)=a₁₁a₂₂-a₁₂a₂₁

eu tot am rezolvat, dar nimic..nu mi da egaliatea