diff ( y , x , 1 ) = ln(sqrt(0.1 * x + 0.2)); ! Digits := 32; max_terms := 30; ! x_start := 10.0; x_end := 11.0; diff(y,0,exact_soln_y(x_start)); glob_look_poles := true; glob_max_iter := 1000000; glob_max_h := 0.00001; ! exact_soln_y := proc(x) return(5.0 * ln(0.1 * x + 0.2) * ( 0.1 * x + 0.2) - 0.5 * x - 1.0); end;