TeX джерело:

\frac{{{x^2} - {y^2}}}{{2xy}}:\frac{{x + y}}{{4x}} = \frac{{{x^2} - {y^2}}}{{2xy}} \cdot \frac{{4x}}{{x + y}} = \frac{{(x + y)(x - y) \cdot 4x}}{{2xy \cdot (x + y)}} = \frac{{2(x - y)}}{y}