Identify the type of conic section represented by x2−4xy+4y2+2x−4y+1=0x^2 - 4xy + 4y^2 + 2x - 4y + 1 = 0x2−4xy+4y2+2x−4y+1=0.
Ellipse
Hyperbola
Parabola
Pair of parallel lines