tg a + cotg a = sec a * cosec a
sen a / cos a + cos a / sen a = 1/ cos a * 1/ sen a
sen a / cos a ( sen a)+ cos a / sen a ( cos a) = 1/ cos sen a
sen^2 a / cos sen a + cos ^2 a/ cos sen a = 1/ cos sen a
"" Se elimina el denominador, ya que todos poseen el mismo denominador"2
sen^2 a + cos^2 a = 1
1 = 1
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tg a + cotg a = sec a * cosec a
sen a / cos a + cos a / sen a = 1/ cos a * 1/ sen a
sen a / cos a ( sen a)+ cos a / sen a ( cos a) = 1/ cos sen a
sen^2 a / cos sen a + cos ^2 a/ cos sen a = 1/ cos sen a
"" Se elimina el denominador, ya que todos poseen el mismo denominador"2
sen^2 a + cos^2 a = 1
1 = 1