sin ge方式

如果x是in degree的話，請睇：
http://hk.knowledge.yahoo.com/question/question?qid=7007121203294
http://hk.knowledge.yahoo.com/question/?qid=7007081003096
http://en.wikipedia.org/wiki/Exact_trigonometric_constants


如果x是in radian的話，
根據http://en.wikipedia.org/wiki/Trigonometric_function#Series_definitions：

圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/trigonometricfunction/trigonometricfunction.jpg

Un is the nth up/down number and please see http://en.wikipedia.org/wiki/Boustrophedon_transform for more information.


圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/trigonometricfunction/trigonometricfunction1.jpg


圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/trigonometricfunction/trigonometricfunction2.jpg


圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/trigonometricfunction/trigonometricfunction3.jpg


圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/trigonometricfunction/trigonometricfunction4.jpg


圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/trigonometricfunction/trigonometricfunction5.jpg


圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/trigonometricfunction/trigonometricfunction6.jpg


圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/trigonometricfunction/trigonometricfunction7.jpg


圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/trigonometricfunction/trigonometricfunction8.jpg


圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/trigonometricfunction/trigonometricfunction9.jpg

方式就唔知... 但係我可以話你知... sin x 同 cos x 都係介乎 -1 至1

而tan x就 係由 負無限 到 正無限

通常考試係唔會唔比一d hints你去計個 sin, cos 或者 tan

即係好似咁.. 唔比咩triangle你 同 其他 trigonometric ratio你~ 正接咁搵 sin x , cos x 同 tan x 係冇乜可能= ="

sin30=0.5
cos30=root3 over 2
tan30=1 over root 3
sin45=1 over root 2
cos45=1 over root 2
tan45=1
sin60=root 3 over 2
cos60=0.5
tan60=root 3

sine, cosine, tan都係一D函數...

如你唔想用calculator....

可用sine curve, cosine curve, and tan curve.....

但係用calculator會快and easy好多....

我only can help u that much~~~

Hope u can find your way to calculate those maths!!