diff ( y , x , 1 ) = sqrt(sqrt(0.1 * x + 0.2)); ! Digits := 32; max_terms := 30; ! x_start := 0.1; x_end := 0.5 ; diff(y,0,exact_soln_y(x_start)); glob_look_poles := true; glob_max_iter := 1000000; ! exact_soln_y := proc(x) return(0.8 * (x + 2.0) * sqrt(sqrt(0.1 * x + 0.2))); end;