(a)Express cosθ in terms of b and c.
(b)Hence find the value of sinθ+cosθ.
更新1:
(b)Hence find the value of sin²θ+cos²θ.
Maths!!!!!!
2008-04-08 1:31 am
Suppose sinθ=-b/c where b,c>0 and c>b.lies in quadrant III.
(a)Express cosθ in terms of b and c.
(b)Hence find the value of sinθ+cosθ.
(a)Express cosθ in terms of b and c.
(b)Hence find the value of sinθ+cosθ.
回答 (1)
2008-04-08 2:11 am
✔ 最佳答案
a) If θlies in the 3rd quad., it is -VE. cos θ= - √( c2 - b2 ) / c
b) sin θ+ cos θ
= - b / c - √( c2 - b2 ) / c
= - [ b + √( c2 - b2 ) ] / c
2008-04-09 11:20:16 補充：
http://s238.photobucket.com/albums/ff245/chocolate328154/?action=view¤t=Maths230.jpg
參考: My Maths Knowledge
收錄日期: 2021-04-23 20:33:13
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