Expansion formula of COS sin power series RT

Expansion formula of COS sin power series RT

Cosx = 1 - (x ^ 2) / (2!) + (x ^ 4) / (4!) - (x ^ 6) / (6!) +... X belongs to (negative infinity, positive infinity)
SiNx = x - (x ^ 3) / (3!) + (x ^ 5) / (5!) - (x ^ 7) / (7!) +... X belongs to (negative infinity, positive infinity)