Simplify: \gb(\acx2y)\g_b (\ac{x^2}{y})\gb(\acx2y).
2(\gbx−\gby)2(\g_b x - \g_b y)2(\gbx−\gby)
2\gbx−\gby2\g_b x - \g_b y2\gbx−\gby
\gb(2x−y)\g_b (2x - y)\gb(2x−y)
\gbx2+\gby\g_b x^2 + \g_b y\gbx2+\gby