theorem Th36:
  cos.th=Sum(th P_cos) & sin.th=Sum(th P_sin)
proof
  reconsider th as Real;
   sin.th = Im(Sum((th*<i>) ExpSeq)) & cos.th=Re(Sum((th*<i>) ExpSeq)) by Def16
,Def18;
  hence thesis by Th35;
end;
