(* Verifiable in MuPAD*)
Axiom tan_MaxBank_approx : (tan_lb_MaxBank < tan MaxBank < tan_ub_MaxBank)%R.

(* Specifications: *)
Lemma tan_MaxBank_ub : (tan MaxBank < tan_ub_MaxBank)%R.
Lemma tan_MaxBank_lb : (tan_lb_MaxBank < tan MaxBank)%R.
Lemma tan_MaxBank_pos : (0 < tan MaxBank)%R.