cotan(a)sec( =cosec(a)
cos(a)/sen(a) * 1/cos(a) =cosec(a)
1/sen(a) =cosc(a)
cosc(a) =cosc(a)
tanx+cotx = secxcoscx uso x por comodidad
senx/cosx + cosx/senx = secxcoscx
[sen^2(x) + cos^2 (x)]/cosx senx = secxcoscx
1/cosxsenx = secxcoscx
1/cosx*1/senx = secxcoscx
secxcoscx = secxcoscx
1+cot^2(x) =csc^2(x)
1+ cos^2(x)/sen^2(x) =csc^2(x)
[(sen^2(x)+cos^2(x)]/sen^2(x) = csc^2(x)
1/sen^2(x) = csc^2(x)
csc^2(x) =csc^2(x)
