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1) TanA + CosA = SecA * CtgA
= SecA * CtgA
2) TanA * SenA + CosA = SecA
*SenA + CosA
+ CosA
= SecA
4) Sen²A * (1+Cot²A) = 1
Propiedad: 1 + Cot²A = Csc²A
Sen²A * Csc²A
Sen²A * = 1