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Cos(x+45)=Cosx√2/2-Senx√2/2
Cos(x+45)=√2/2(Cosx-Senx)=√2/6
√2/2(Cosx-Senx)=√2/6
Cosx-Senx=1/3
Elevemos al cuadrado ahora
(Cosx-Senx)²=1/9
1 - 2CosxSenx=1/9
Ahora despejamos CosxSenx
1-1/9=2CosxSenx
4/9=CosxSenx
Entonces
CosxSenx=4/9 (Respuesta)