diff ( y , x , 1 ) = m1 * 2.0 * x / (x * x + 1.0) /( x * x + 1.0); ! Digits := 32; max_terms := 30; ! x_start := -2.0; x_end := 1.0; diff(y,0,exact_soln_y(x_start)); glob_h := 0.1; glob_look_poles := true; glob_max_iter := 50; ! exact_soln_y := proc(x) 1.0 / (x * x + 1.0); end;