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Recordemos la identidad trigonométrica para cotangente:
cot²(a) + 1 = csc²(a)
csc(a) = 1/sen(a)
csc²(a) = 1/sen²(a)
Reescribiendo la expresion
sen²(a)*[1/sen²(a)]; Cancelo sen²(a) quedaria 1
sen²(a)*[cot²(a) + 1] = 1