Poti alege orice variabilitate sa aiba x,o sa iti dea graficul identic.
a) f(x)=1 => f(1)=3 A(1,3) apartine numerelor naturale(1,2,3.......)e N
b)f(x)=1 => f(1)= -2 B(1,-2) apartine numerelor intregi (...-3,-2,-1,0,1,2...)e Z
c)f(x)=1 => f(1)= 4 C (1,4) apartine numerelor reale. e R
