diff ( y , x , 3 ) = m1 * diff ( y , x , 1 ) ; ! Digits := 32; max_terms := 30; ! x_start := -1.0; x_end := -0.99 ; diff(y,0,exact_soln_y(x_start)); diff(y,1,exact_soln_yp(x_start)); diff(y,2,exact_soln_ypp(x_start)); glob_look_poles := true; glob_max_iter := 1000000000; glob_display_interval := 0.00001; glob_max_minutes := 2; glob_desired_digits_correct := 10; ! exact_soln_y := proc(x) return( - cos(x)); end; exact_soln_yp := proc(x) return( sin(x)); end; exact_soln_ypp := proc(x) return( cos(x)); end;