Looks like there's a bug in the quotient rule. Last I checked, the derivative of (x/1) is not (1-x)/x^2 . Screenshot: http://i.imgur.com/bYiDjAZ.png http://i.i

Looks like there's a bug in the quotient rule. Last I checked, the derivative of (x/1) is not (1-x)/x^2 . Screenshot: http://i.imgur.com/bYiDjAZ.png http://i.imgur.com/bYiDjAZ.png Fix: http://pastebin.com/raw.php?i=NfBiqia0 http://pastebin.com/raw.php?i=NfBiqia0