Re: [中學] 三角函數~
※ 引述《gintgonhz (Determination)》之銘言:
: 上來請教各位,請幫忙解這兩題,三角函數想融會貫通不知道有什麼祕方?XD
: https://i.imgur.com/4LYwhve.jpg
![](https://i.imgur.com/4LYwhve.jpg)
(1)
k/3 = cotθtanθ = 1
=> k = 3
(2)
11/3 = cotθ + tanθ = (secθ)^2 / tanθ
= 1 / (sinθcosθ)
=> sinθcosθ = 3/11
: https://i.imgur.com/ihDePot.jpg
![](https://i.imgur.com/ihDePot.jpg)
(1/2) 30 π/180 - [π/4 - (1/2) 30 π/180 - (1/4)√3]
= π/6 - π/4 + (1/4)√3
= (1/4)√3 - π/12
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