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日本高中数学课本《三角》部分的内容与我国基本类似,有三角函数和加法定理两大部分．三角函数中,只介绍了三种函数:正弦、余弦、正切,以及它们的图象和性质(奇偶性、增减性、周期性)．并且延伸到图象的伸缩、平移变化．还将三角函数与方程、不等式联系起来．
The contents of the “triangular” part of the Japanese high school mathematics textbook are basically similar to those of our country. There are two major parts: trigonometric functions and additive theorems. In trigonometric functions, only three functions are introduced: sine, cosine, tangent, and their image and properties (parity, increase, decrease, periodicity). And it extends to the extension and translation of the image. We also associate trigonometric functions with equations and inequalities.