tangent
tangent 英 [ˈtændʒənt] 美 ['tændʒənt]
adj. 切线的，相切的；接触的；离题的 n. [数] 切线，[数] 正切
名词复数:tangents
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- adj. 切线的，相切的；接触的；离题的
- n. [数] 切线，[数] 正切
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1. The direction is tangent to the trajectory.
方向就是轨道的切线方向。
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2. If you want strict equalities in approximations means that we replace the function by its tangent approximation.
如果你想要严格的近似等式,那就意味着我们要用切线逼近来取代原函数。
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3. But, the dominant motion, near the origin is really where it goes down and back up, so answer number four, you have vertical tangent.
不过主要的运动，在原点附近的话,是向下再向上的，所以答案是第四个，有一个垂直的切线。
- tangent (adj.) 1590s, "meeting at a point without intersecting," from Latin tangentem (nominative tangens), present participle of tangere "to touch," from PIE root *tag- "to touch, handle." First used by Danish mathematician Thomas Fincke in "Geomietria Rotundi" (1583). Extended sense of "slightly connected with a subject" is first recorded 1825. Related: Tangence; tangency.
- tangent (n.) 1590s as a geometric function, from tangent (adj.). From 1650s as "a tangent line." Figurative use of off on a tangent is from 1771.
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