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cscФ cosФ
-------- + ----------- = 2cotФ Pero cscФ = 1/senФ , secФ = 1/cosФ y
secФ senФ cosФ/senФ = cotФ reemplazas
1
--------
senФ
------------ + cotФ = 2cotФ Aplicas ley de la oreja
1
---------
cosФ
cosФ
--------- + cotФ = 2cotФ Pero cosФ/senФ = cotФ reemplazas
senФ
cotФ + cotФ = 2cotФ
2 cotФ = 2cotФ