若正角α、β、γ满足α+β+γ=π,则α、β、γ可作为一个三角形的三内角。据此,可将三角中的一些问题化归为三角形中的问题,凭籍三角形的有关知识可获得新颖、独特、简捷的解法。本文对此作出初步的探讨。一、求三角函数式的值 If the positive angles α, β, γ satisfy α+β+γ=π, then α, β, and γ can be used as a triangle’s internal angle. Based on this, some problems in the triangle can be categorized as problems in the triangle, and the knowledge of the triangle can be used to obtain novel, unique, and simple solutions. This article makes a preliminary discussion on this. First, the value of the trigonometric function