diff ( y , x , 1 ) = ln (0.1 * x + 0.2) ; ! Digits := 32; max_terms := 30; ! x_start := 20.0; x_end := 30.0 ; diff(y,0,exact_soln_y(x_start)); glob_look_poles := true; glob_max_iter := 20; ! exact_soln_y := proc(x) return(10.0* (0.1 * x + 0.2) * ln(0.1 * x + 0.2) - x - 2.0); end;