正切的英文：
secant
tangent

参考例句：
  • The tangent may be used to find the direction
    这方向也可用正切求得。
  • The tangent is a relatively important concept in trigonometry.
    "正切"是三角学中的一个相对重要的概念。
secant是什么意思：
a. 割的,切的,交叉的
n. 割线,正切
  • The secant of the complement of a directed angle or arc.
    余割有向角的余角或弧的余割
  • A secant is defined as line passing through two points of the curve.
    割线的定义是一条通过曲线上两点的直线。
tangent是什么意思：
n. 正切；直线区间；突兀的转向；突然转移话题
  • The direction is tangent to the trajectory.
    方向就是轨道的切线方向。
  • The tangent is a relatively important concept in trigonometry.
  • The graph of a concave function is always below its tangent.
    一个凹函数的图象总在它的切线的下方。
  • Arrowheads on the lines indicate the direction in which the tangent is to be drawn
    电力线上的箭头表示所要画的切线方向。
  • Don't fly off at a tangent, we are talking about the money problem.
    不要扯别的，我们谈的是那笔钱的问题。

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