---------------------------------------- Description: The domain of x^3*(x+1)/(x+1) is not recognized properly Explanation: Maxima treats x^3*(x+1)/(x+1) as x^3 Solution: Sorry, this is the limitation from CAS which is behind the scene. -------------------------------------------- Description: Derivative of asin(sin(x*log(3*x**5-3*x**(-5)))-3*log(sin(x*log(3*x**5-3*x**(-5))))) fails Explanation: The computation is too long and refused after 10 sec. Solution: Use your own server and increase time limit. -------------------------------------------- Description: radcan simplifies derivative of asin((x+1)/(x-1)) in and incorrect way ( sqrt(x^2-2*x+1) is simplified into x-1, not abs(x-1) ) Explanation: Maxima works like this. There are flags which inhibit this beahvior, but using these flags may cause other problems. Solution: Do not trust everything computed by CAS or install MAW on your server and remove radcan from the chain called when simplifying derivative.