diff ( y , x , 1 ) = 1.0/ (x * x + 1.0) ; ! Digits := 32; max_terms := 30; ! x_start := -2.0; x_end := 1.0; glob_h := 0.00001; diff(y,0,exact_soln_y(x_start)); glob_look_poles := true; glob_adjust_h := false; glob_max_iter := 100; ! exact_soln_y := proc(x) arctan(x); end;