for "a" and "b" are real numbers prove that:
ImageShack - Image Hosting :: 34860604zw7.gif
for "a" and "b" are real numbers prove that:
ImageShack - Image Hosting :: 34860604zw7.gif
first we have
|a-b|>=||a|-|b||
what did you do at the first step in order to transform it into
http://img152.imageshack.us/img152/5374/52524050qr2.gif