Respuestas

2013-06-11T02:33:21+02:00
Sen(x)/sen(x)  + cos(x)/sen(x) = 1 + ctg(x)

1 + cotg = 1 + ctg

cos(x)/cot(x)=sen(x)

cos(x)/(1/tan(x)=sen(x)
cos(x)/(1/sen(x)/cos(x)=sen(x)
cos(x)/(cos(x)/sen(x)=sen(x)
(cos(x)*sen(x))/cos(x)=sen(x)
sen(x)=sen(x)