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在三角函数一章中,有一个基本的不等式: 当0≤x≤时,有sin x≤x≤tan x, (*) 这是把x的三角函数与x值直接联系起来的重要不等式,当且仅当x=0时等号成立.下面看一下它的应用.
In the chapter of trigonometric functions, there is a basic inequality: when 0 ≤ x ≤ sin x ≤ x ≤ tan x, (*) This is an important inequality that directly connects the trigonometric function of x with the value of x. If and only if x = 0 when the equal sign is established. Let’s look at its application.