diff ( y , x , 1 ) =  tan ( x ) ;
!
Digits := 32;
max_terms := 30;
!
x_start := 0.0;
x_end := 5.0 ;
array_y_init[1] := exact_soln_y(x_start);
glob_h := 0.00001 ;
glob_look_poles := true;
glob_max_iter := 10;
!
exact_soln_y := proc(x)
	-log(abs(cos((x))))
end;