proposition: Lemma sin_neg : forall x:R, sin (- x) = - sin x.
proof: Proof. apply sin_antisym. Qed.
imports: Rbase Rfunctions SeqSeries Rtrigo_fun Rtrigo_def Rtrigo_alt Cos_rel Cos_plus ZArith_base Zcomplements Lia Lra Ranalysis1 Rsqrt_def PSeries_reg