| 字词 | 三角函数 |
| 释义 | sinA=a/c, cosA=b/c, tgA=a/b, ctgA=b/a, secA=c/b, cscA=c/a。三角函数的概念可推广到任意角。对于任意角α,以角的顶点为原点,角的始边作X轴正方向,建立平面直角坐标系XOY,设P(x, y)为角α终边上任意一点,P点到原点距离为 r=(x2＋y2)＞0。则sinα=y/r, cosα=x/r, tgα=y/x, ctgα=x/y, secα=r/x, cscα=r/y。{circular function; trigonometric function; function expressed as the ratio of the sides of a right triangle, with each acute angle having six trigonometric functions — sine, cosine, tangent, cotangent, secant, and cosecant. For example, the trigonometric functions of the acute angle ∠A are sinA=a/c, cosA=b/c, tgA=a/b, ctgA=b/a, secA=c/b and cscA=c/a. The concept of trigonometric function can be extended to any angle. Take arbitrary angle α for example. Use the vertex of angleα as the origin, and its initial line as the positive direction of the axis X, and establish the plane right-angle coordinate system XOY. Suppose P(x, y) is an arbitrary point on the terminal line of α, and the distance from P to the origin is r=(x2＋y2)＞0. Then sinα=y/r, cosα=x/r, tgα=y/x, ctgα=x/y, secα=r/x, cscα=r/y} |
| 随便看 |
汉译英翻译词典收录62485条汉英翻译词条，基本涵盖了全部常用中文字词的英语拼写、翻译、音标、读音、用法、例句等，是英语学习的有利工具。