On page 14-3 of the 50G Users manual are some commands to use the DESOLVE. The second example is entering:

['d1d1y(t)+5*y(t)=2*COS(t/2)' 'y(0)=6/5' 'd1y(0)=-1/2']ENTER 'y(t)' ENTER DESOLVE

The solution "should" be in terms of sine and cosine, as is reported in the manual. Mine keeps the solution in terms of the complex expressions e^(a+bi), etc. I can certainly do the rewriting myself, but what possible setting am I missing to have the calculator to convert to sines and cosines?

The modes I am using are: soft menues, RPN, RAD, Complex, 't' var, the usual... But I must be overlooking something.

Any suggestions?

Thanks, all.