Section Cosinus2.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.
Global Instance lcos_morphism :
Proper (EqL ==> EqL ==> eq ==> iff) Lcos.

Lemma lcos_uniqueness : forall l a l1 l2, Lcos l1 l a-> Lcos l2 l a -> EqL l1 l2.