Practice problem
Simplify y4−xy3−x3y+x2y2x2+y2\dfrac{y^4-xy^3 -x^3y+x^2y^2}{x^2+y^2}x2+y2y4−xy3−x3y+x2y2, where x,yx,yx,y are positive real numbers.
y2−xyy^2 -xyy2−xy
x2−xyx^2 -xyx2−xy
xy−y2xy - y^2xy−y2
xy−x2xy-x^2xy−x2
Type a concept, like “slope” or “photosynthesis”.