什麼是Cos、sin及tan？

姐係三角形 既
sin cos tan
對/斜 鄰/斜 對/鄰
(數學公式黎)
通常計下三角形d角度 ,用計學機計~
sin cos tan 計三角形既邊,角度面積高果d都好有用

2006-12-13 00:55:33 補充：
睇下部計數機上便都應該有依3樣野

A right-angled triangle is a triangle in which one of the angles is a right-angle. The hypotenuse of a right angled triangle is the longest side, which is the one opposite the right angle. The adjacent side is the side which is between the angle in question and the right angle. The opposite side is opposite the angle in question.

In any right angled triangle, for any angle:
The sine of the angle=The length of the opposite side÷the length of the hypotenuse
The cosine of the angle=The length of the adjacent side÷the length of the hypotenuse
The tangent of the angle=The length of the opposite side÷the length of the adjacent side

So in shorthand notation:
sin=o/h cos=a/h tan=o/a
Often remembered by: soh cah toa