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Cos(a-b)=cosa(cosb)+seno
a(senb)
Sustituyendo
Cos(45°+x) )+cos(45-x)=
Cos45(cosx) -sen45(senx) +cos45(cosx)+sen45(senx)
Gactorizando queda
Cos45(cosx+cosx)+sen45(-senx+senx)
Simplificando= 2 Cos45(cosx)