NEED HELP ASAP!! Find a two-variable identity by incorporating a second variable, y, into the single-variable identity. Note that x > 1, x > y, and x and y are positive integers. (x2 − y2)2 − (2xy)2 = (x2 + y2)2 (x2 + y2)2 + (2xy)2 = (x2 − y2)2 (x2 − y2)2 + (2xy)2 = (x2 + y2)2 (x2 − y2)2 + (2xy)2 = (x2 − y2)2