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Restringeti in patrate:
a) [tex] a^{2} + 2ay + y^{2} [/tex] ;
b) [tex] b^{2} + c^{2} - 2bc[/tex] ;
c) [tex]2xz + z^{2} + x^{2} [/tex] ;
d) 9-6y + [tex] y^{2} [/tex]



repede repede !!!!