diff ( y , x , 1 ) = m1 * 2.0 / x / x / x ; ! Digits := 32; max_terms := 30; ! x_start := -1.0; x_end := 0.7; diff(y,0,exact_soln_y(x_start)); glob_h := 0.0001; glob_look_poles := true; glob_max_iter := 100; ! exact_soln_y := proc(x) return(1.0/x/x); end;