[x2a+xyhxyh+y2b]\left[x^{2} a+x y h \quad x y h+y^{2} b\right][x2a+xyhxyh+y2b]
[x2a+2xyh+y2b]\left[x^{2} a+2 x y h+y^{2} b\right][x2a+2xyh+y2b]
[2x2a+xyh+2y2b]\left[2 x^{2} a+x y h+2 y^{2} b\right][2x2a+xyh+2y2b]