diff ( y1 , x , 1 ) = m1 * y2; diff ( y2 , x , 1 ) = y1; ! Digits := 64; max_terms:=30; ! x_start := 0.2; x_end := 0.6; diff(y1,0,exact_soln_y1(x_start)); diff(y2,0,exact_soln_y2(x_start)); glob_look_poles := true; glob_max_iter := 1000000; glob_display_interval := 0.01; glob_max_minutes := 10; glob_max_h := 0.0001; ! exact_soln_y1 := proc(x) return(cos(x)); end; exact_soln_y2 := proc(x) return(sin(x)); end;