Respuestas

2012-05-21T02:47:26+02:00

son las del angulo doble cos(x-y)= cos(x)cos(y) + sen(X)sen(y)

cos(x+y)=cos(x)cos(y) - sen(X)sen(y)

sen(x+y)= sen(x)cos(y) +cos(x)sen(y)

sen(x-y)=sen(x)cos(y) -cos(x)sen(y)