proposition: Lemma injective_open_interval_tan : injective_open_interval (- PI / 2) (PI / 2) tan.
proof: Proof. apply strictly_increasing_in_injective_in, strictly_increasing_open_interval_tan. Qed.
imports: Rbase Rtactic Lra Ranalysis Ranalysis5 Rtrigo AltSeries Rfunctions Rinterval Ranalysis_def Ranalysis_def_simpl Ranalysis_facts Rextensionality Rpser_usual Rsequence_cv_facts MyRIneq Tactics