asked 2017-01-28 22:44:30 -0500
This post is a wiki. Anyone with karma >750 is welcome to improve it.
If you ask sage to symbolically integrate the following properly, the answer is wrong. Why?
cos(x)/(acos(x) + bsin(x))
[Aside -- the captcha was invisible with firefox 50.1/linux, leading to much teeth-gnashing. Seems to work OK with Chrome. Not happy]