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1/sen(o)-sen(o)=cot(o)cos(o)
(sen^2(o)-1)/sen(o) = cot(o)cos(o)
pero sabemos que Sen^2-1(o) =Cos^2(o)
cos^2(o)/sen(o)= cot(o)cos(o)
[cos(o)/sen(o)]cos(o)=cot(o)cos(o)
cot(o)cos(o)=cot(o)cos(o)