proposition: Lemma sin2pi : sin (pi *+ 2) = 0.
proof: Proof. by rewrite mulr2n sinD sinpi cospi !mulrN1 mulr0 oppr0 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