diff ( y , x , 1 ) = arctan (0.1 * x + 0.2 ) ; ! Digits := 32; max_terms := 30; ! x_start := -1.0; x_end := 5.00 ; diff(y,0,exact_soln_y(x_start)); glob_h := 0.00001 ; glob_look_poles := true; glob_max_iter := 100; ! exact_soln_y := proc(x) return(10.0 * (0.1 * x + 0.2) * arctan(0.1 * x + 0.2) - 5.0 * ln(1.0 + expt((0.1 * x + 0.2) , 2))); end;