Hi, the Ginac documentation says: "GiNaC is not very good (yet?) at symbolically evaluating integrals" so I though I might help it along. Code for sin() and cos() is in this branch which is based on the current master: https://github.com/jrheinlaender/ginac/tree/jrheinlaender/integral and if you like it I might add more functions. Jan Rheinländer