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给出了涉及三角形半角正切的一组公式及几个伴生结论,并用其巧妙地证明了一系列典型的等式或不等式;给出了几个三角形不等式的等价性论证及两个几何不等式的加强.
A set of formulas and several associated conclusions about the trigonometric tangent of the triangle are given. A series of typical equations or inequalities are proved by using the method. Equivalence proofs of several triangular inequalities and two geometric inequalities strengthen.