DEMOSTRACION

SEN(X+2PI)= SEN X
SEN(X+Y)=SENX*COSY+SENY*COS X
SENX*COS2PI+SEN2PI*COSX
SENX*1+0*COSX
SENX=SENX.


COS(X+2PI)= COSX
COS X* COS2 `PI- SENX* SEN 2 PI
COSX*1- SENX*0
COSX=COSX