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Aratati ca urmatoare functii sunt bijective
a)F:[1,infinit)->[1,infinit)
f(x)=x^2-2x+2
b)F:(0,infinit)->(1,infinit)
f(x)=x^2+1/x^2
c)F:(1,infinit)->(2,infinit)
f(x)=2x^2-4x+3/x^2-2x+1