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整个中学数学教学都貫串着以函数为中心,在三角中当然也不例外。过去旧課本对这部分無論是教材或習題都不符合大綱要求,而新課本則对这部分比較注意,特別習題配得类型較为全面。虽然这样,但是新課本对于利用圖象来討論三角函数性質的叙述我仍感到过于簡單一些,特別对函数变化情况的叙述欠有系統詳細。例如增減区間,对称关系,奇偶性等都沒有提出,我認为是美中不足之处。
The whole middle school mathematics teaching is centered on function, and of course in the triangle. In the past, old textbooks did not meet the requirements of the syllabus for textbooks or exercises. New textbooks pay more attention to this section, and the types of special assignments are more comprehensive. Although this is the case, the new textbook is still too simple for the use of images to discuss the nature of trigonometric functions, and in particular, the description of function changes is not systematically detailed. For example, the range of increase and decrease, symmetry, parity, etc. have not been proposed. I think it is a fly in the ointment.