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[1+tan^2(B)]/csc^2(B)=tan^2(B)
sec^2(B)/csc^2(B)=tan^2(B)
[1/cos^2(B)]/[1/sen^2(B)]=tan^2(B)
sen^2(B)/cos^2(B) =tan^2(B)
Q.E. D.
(1 + tg²b)/csc²b = tg²b --->Propiedad: 1 + tg²x = sec²x
sec²b/csc²b = tg²b --->Propiedad: 1/senx = cosx y 1/cosx = senx
(1/cos²b)/(1/sen²b = tg²b --->Extremos medios (a/b)/(c/d) = ad/bc
sen²b/cos²b = tg²b --->Propiedad: senx/cosx = tgx
tg²b = tg²b ---> Lo que queremos demostrar