Hello
I came upon some strange integration results :
(%i1) integrate(cos(2*x)*cos(x),x);
(%o1) -cos(3*x)/6-cos(x)/2
(%i2) ev(%,x=2),numer;
(%o2) 0.048045037165177
(%i3) integrate((cos(x)^2-sin(x)^2)*cos(x),x);
(%o3) sin(x)-(2*sin(x)^3)/3
(%i4) ev(%,x=2),numer;
(%o4) 0.40807946371302
the second result seems correct.
Best regards,
Bruno Torremans