Wow. That is a stunningly bad captcha. Just really bad ... I sometimes wonder how these things went from trying to solve a simple problem, to creating unusable provisioning processes for users everywhere...
It's even for a human to recognize that stuff. I usually get the captchas wrong a few times before getting it right, I supose that it'll be even worse if people start doing that.
Even worse: A partial derivative captcha<p><a href="http://brad.livejournal.com/2331278.html" rel="nofollow">http://brad.livejournal.com/2331278.html</a>