Respuesta:
Explicación paso a paso:
*sen(x+y)=6.sen(x-y)
*sen(x)cos(y)+sen(y)cos(x)=6[sen(x)cos(y)-sen(y)cos(x)]
*7.sen(y)cos(x)=5.sen(x)cos(y)
*tag(y)ctg(x)=5/7 ó *tag(x)ctg(y)=7/5