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文［１］介绍焦点三角形内角三角函数与离心率之间的一个有用关系式．本文推出其姊妹篇，即顶点三角形内角三角函数与离心率之间的一个有用的关系式，供读者解题编题参考．定理 Ｐ是椭圆ｂ２ｘ２＋ａ２ｙ２＝ａ２ｂ２（ａ＞ｂ＞０）或双曲线ｂ２ｘ２－ａ２ｙ２＝ａ２ｂ２（ａ?
The paper [1] introduces a useful relationship between the trigonometric function and the eccentricity of the inner triangle of the focal triangle. This article presents its companion article, a useful relationship between the trigonometric function of the vertex triangle interior angle and the eccentricity, for the reader to solve the problem title reference. Theorem P is the ellipse b2x2+a2y2=a2b2 (a>b>0) or hyperbola b2x2-a2y2=a2b2 (a?