a/ \(\left(x+2\right)^2=x^2+4x+4\)
b/ \(\left(x-1\right)^2=x^2-2x+1\)
c/ \(\left(x^2+y^2\right)^2=x^4+2x^2y^2+y^4\)
d/ \(\left(x^3+2y^2\right)^2=x^6+4x^3y^2+4y^4\)
e/ \(\left(x^2-y^2\right)^2=x^4-2x^2y^2+y^4\)
f/ \(\left(x-y^2\right)^2=x^2-2xy^2+y^4\)