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tanA * senA = sen² * secA (tanA = senA/cosA reemplazas)
senA/cosA *senA = sen²A * secA
sen²A/cosA = sen²A * secA
sen²A * 1/cosA = sen²A * secA (Pero secA = 1/cosA reemplazas)
sen²A * secA = sen²A * secA