1.
(a) Prove sinθ/(1-cosθ) -cotθ =cscθ.
(b) Hence or otherwise, simply {sin²(-θ) / [cos(θ+180°)+1]} +tan(θ+270°)cos(90°-θ)-cos²(720°+θ), where θ is measured in degree
2. Given that cos(45°-θ) is the repeated root of the equation 5x² +2√(15)x +k=0,
(a) find k.
(b) hence or otherwise, evaluate sin(45°-θ) +cot²(45°+θ).
M2 Trigonometry (2)
2015-01-19 2:06 am
回答 (1)
2015-01-19 4:58 am
✔ 最佳答案
Please Read：圖片參考：https://s.yimg.com/rk/HA07344914/o/418792923.png
2015-01-18 21:09:49 補充：
最後哥行應該係
「= ± (3√10 - 5√6)/15」
收錄日期: 2021-04-15 17:59:52
原文連結 [永久失效]:
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