Simplifying sin^2+cos^2

Hi, I'm working on some symbolic algebra for the solution of a 6R robot manipulator. The expressions I'm dealing with have a lot of cos(x)^2+sin(x)^2 terms. Is there any way I can simplify these within GiNaC to get these terms equal to 1? Best Tony -- Tony Csoka Tel : +44 1235 44 6381 R3 2-23 Fax : +44 1235 44 5720 Rutherford Appleton Laboratory Chilton E-mail : T.Csoka@rl.ac.uk Didcot Oxon OX11 0QX United Kingdom "The probability of someone watching you is proportional to the stupidity of your action." - To UNSUBSCRIBE, email to ginac-list@ginac.de with a subject of "unsubscribe".