Maths唔識抵死題(16/09)
2010-09-17 3:36 am
6b) find the values of sin y/2, cos y/2 and tan y/2 when y is acute and sin y =3/5
回答 (3)
2010-09-18 7:07 am
✔ 最佳答案
圖片參考：http://imgcld.yimg.com/8/n/HA00408036/o/701009160097313873371603.jpg
If there is any mistake, please inform me.
參考: My Maths knowledge
2010-09-17 6:40 am
how to get the 0.3162, 0.9487 and 0.3333, show me the complete workings!!!!!!!!
2010-09-17 4:08 am
sin y =3/5
y=36.8699 or 143.1301 or 216.8699 or 323.1301deg
since y is acute which is no larger than 90deg, y should be equal to 36.8699,
so that,
sin y/2=0.3162
cos y/2=0.9487
tan y/2=0.3333
* all the values accurate to 4 d.p.
y=36.8699 or 143.1301 or 216.8699 or 323.1301deg
since y is acute which is no larger than 90deg, y should be equal to 36.8699,
so that,
sin y/2=0.3162
cos y/2=0.9487
tan y/2=0.3333
* all the values accurate to 4 d.p.
收錄日期: 2021-04-13 17:31:08
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100916000051KK00973