diff ( y , x , 1 ) = sin ( x ) + sin ( x ) ; ! max_terms := 30; Digits := 32; ! x_start := -5.0; x_end := 5.0 ; diff(y,0,exact_soln_y(x_start)); glob_h := 0.05 ; glob_look_poles := true; glob_max_iter := 100; glob_display_interval := 0.1; glob_max_minutes := 10; ! exact_soln_y := proc(x) return(2.0 - cos(x) - cos(x)); end;