simplify \dfrac{bx(a^2x^2 2a^2y^2 b^2y^2) ay(a^2x^2 2b^2x^2 b^2y^2)}{bx ay} bx ay bx(a 2 x 2 2a 2 y 2 b 2 y 2 ) ay(a 2 x 2 2b 2 x 2 b 2 y 2