proposition: Lemma sin_le1 x : sin x <= 1.
proof: Proof. by have /ler_normlP[] := sin_max x. Qed.
imports: mathcomp(all_ssreflect ssralg ssrint ssrnum matrix) mathcomp(interval rat) mathcomp(mathcomp_extra boolp classical_sets functions) reals ereal nsatz_realtype signed topology normedtype landau sequences derive realfun exp