diff ( y , x , 1 ) = 2.0 / exp(x); ! Digits := 32; max_terms := 30; ! x_start := 1.0; # did poorly with x_start := -5.0; x_end := 5.0 ; diff(y,0,exact_soln_y(x_start)); glob_look_poles := true; glob_max_iter := 1000000; glob_display_interval := 0.1; glob_max_minutes := 10; ! exact_soln_y := proc(x) return(- 2.0/exp(x)); end;