proposition: Lemma sinpi : sin pi = 0.
proof: Proof. by have := sinD (pi / 2) (pi / 2); rewrite cos_pihalf mulr0 mul0r -splitr addr0. 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