S.3 數學題

2007-04-24 4:31 am
 1     cos²θ
---- - ----
sinθ    sinθ
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回答 (4)

2007-04-24 4:34 am
✔ 最佳答案
(1 - cos ²θ)
---------------
sinθ

sin ²θ
= --------
sinθ

= sin θ
參考: 自己
2007-04-24 5:43 am
1     cos²θ
---- - ----
sinθ    sinθ

1 - cos²θ
=--------------------------------------
sinθ

sin 2 θ
=--------------------------------------

sinθ

= sinθ
2007-04-24 4:39 am
cos²θ + sin²θ = 1
所以1-cos²θ=sin²θ
  1     cos²θ
---- - ----
sinθ    sinθ

sin²θ   
= ---- 
sinθ   

=sinθ (約左)
2007-04-24 4:37 am
 1     cos²θ
---- - ----
sinθ    sinθ
  1-cos²θ
=---------
    sinθ
 sin²θ
=-----
  sinθ
 sinθ
=----
  1
=sinθ
參考: 自己


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