(A) =(sinv.cosu)(cos(x+y−u−v)+isin(x+y−u−v)
(B) =(sinu.cosv)(cos(x+y−u−v)+isin(x+y−u−v)
(C) =(sinu.cosv)(cos(x+y−u−v)−isin(x+y−u−v)
(D) =(sinv.cosu)(cos(x+y−u−v)−isin(x+y−u−v)