為何
cos 0=鄰bean/車bean
sin 0=對bean/車bean
tan 0=對bean/鄰bean
about三角比
2007-01-09 9:10 pm
回答 (3)
2007-01-09 9:14 pm
✔ 最佳答案
This is the defination of Trigonometric functions,can't tell you why.
We defined that:
sin=對bean/車bean
cos=鄰bean/車bean
and
tan=sin/cos
By the way, there are:
cot=1/tan
sec=1/cos
cosec=1/sin
參考: me
2007-01-09 9:15 pm
係N年前d數學家出發明出黎
2007-01-09 9:13 pm
自己睇書= =
math書應該有...不過知黎無咩用
math書應該有...不過知黎無咩用
收錄日期: 2021-04-12 21:32:53
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070109000051KK01112