diff ( y , x , 1 ) =  tan (2.0 * x + 3.0 ) ;
!
Digits := 32;
max_terms := 30;
!
x_start := 0.0;
x_end := 5.0 ;
diff(y,0,exact_soln_y(x_start));
glob_h := 0.00001 ;
glob_look_poles := true;
glob_max_iter := 10;
!
exact_soln_y := proc(x)
return(ln(1.0 + expt(tan(2.0 * x + 3.0),2))/4.0);
end;