張玉祥

【摘 要】先通過演繹，邏輯推導得到正割函數(shù)的公式，再利用數(shù)學歸納法證明正割函數(shù)的n階導數(shù)公式。

【關鍵詞】n階導數(shù)；正割函數(shù)；數(shù)學歸納法

【中圖分類號】G633.6 【文獻標識碼】A

【文章編號】2095-3089（2019）02-0024-02

Abstract：The formula of secant function is deduced by logical derivation. We then show that this formula isn-order derivative for secant function via using the mathematical induction.

Keywords：n-order derivative，secant function，mathematical induction