Răspuns:
a.(x^2)^2-1^2/2^2+x^2+1^2/2^2+1/2=(x^2)^2-1/4+x^2+1/4+1/2=(x^2)^2+2/4+x^2+1/2
b.n=impar
n={1,3,5,7,9,11,13,15,17,19,21,23....}
