F.3 MATHS 幾題...*10分!*

2007-09-07 12:29 am
要有埋條式...十萬個唔該!! (°係度數,,---係份數果條線)
1. cosΘ = sin32°
2. tan (90°-Θ) = tan35° 分之 1
3. cos^2 37° + cos^2 53°
4. prove that sinΘ cosΘ tan (90°-Θ)
5. tan 60° - tan 30°
--------------------------- x cos 30° + sin 30°
1+ tan 45°


urgent!!! thanks!!!
更新1:

SORRY... 係要搵Θ,同埋要留番個√係answer度

更新2:

√係如有需要先加...

更新3:

SORRY...第4題漏左d野... 4. prove that sinΘ cosΘ tan (90°-Θ) = 1 - cos^2 (90°-Θ) thanks!!

回答 (3)

2007-09-07 12:50 am
✔ 最佳答案
第4題題目出錯,請check一check...


圖片參考:http://i182.photobucket.com/albums/x4/A_Hepburn_1990/maths.jpg?t=1189068596


2007-09-08 06:58:08 補充:
第4題以補充了。請按reload,將這頁重新整理,便可看到第4題解答。
參考: Myself~~~
2007-09-07 12:42 am
1. Θ= 90°-32° = 58°
2. tan(90°-Θ) =tan(90°-35°)
90°- Θ= 55°
Θ=35°
3. cos^2 37° + sin^2(90°-53°)
=cos^2 37° + sin^27°
=1
4. 個堆野prove做乜野先得架-___-
5. 你將tan60°個d全部變成(sin60°/cos60°)甘就計到架啦
係度好難打出黎-_-
參考: 自己
2007-09-07 12:37 am
都唔知你問乜-_-
搵Θ定factorize


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