正切的英文：
secant
tangent

參考例句：
  • The tangent may be used to find the direction
    這方向也可用正切求得。
  • The tangent is a relatively important concept in trigonometry.
    "正切"是三角學(xué)中的一個(gè)相對(duì)重要的概念。
secant是什么意思：
a. 割的,切的,交叉的
n. 割線,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.
    割線的定義是一條通過(guò)曲線上兩點(diǎn)的直線。
tangent是什么意思：
n. 正切；直線區(qū)間；突兀的轉(zhuǎn)向；突然轉(zhuǎn)移話題
  • The direction is tangent to the trajectory.
    方向就是軌道的切線方向。
  • The tangent is a relatively important concept in trigonometry.
  • The graph of a concave function is always below its tangent.
    一個(gè)凹函數(shù)的圖象總在它的切線的下方。
  • Arrowheads on the lines indicate the direction in which the tangent is to be drawn
    電力線上的箭頭表示所要畫(huà)的切線方向。
  • Don't fly off at a tangent, we are talking about the money problem.
    不要扯別的，我們談的是那筆錢的問(wèn)題。

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