rregullat per llogaritje me logaritma:

[roXor]

http://www.ast-images.com/images/u0mqfgh3tivuyfkkmrf_thumb.gif (http://www.ast-images.com/viewer.php?file=u0mqfgh3tivuyfkkmrf.gif)

http://www.ast-images.com/images/u0mqfgh3tivuyfkkmrf.gif