mathURL

http://mathurl.com/4jn7kj8
<img src="http://mathurl.com/4jn7kj8.png" />

$\frac{x-4}{x+4}-\frac{x+4}{x-4}+\frac{16x}{x^{2}-16}=\frac{(x-4)(x+4)-(x+4)(x-4)+16x}{x^{2}-16}=...=\frac{-16x+16x}{x^{2}-16}=0$

help & about · blog · mathurl at mathurl dot com · by justin kao