Given that cosC + sinC = R cos (C - A), where R>0 and 0<= A<=90
a) Find R and A.
bi) Let y = 1/ (cosC + sinC +2). Find the range of y if 45<= C <= 90.
ii) Let z = (cosC + sinC) / (cosC + sinC +2). Find the maximum value of z if 45<= C <= 90.
Trigonometry
2008-02-18 5:16 am
回答 (2)
2008-02-20 5:36 am
✔ 最佳答案
As follows~圖片參考：http://i248.photobucket.com/albums/gg191/ncy_0916/Trigonometry.jpg?t=1203428153
2008-02-18 5:40 am
a)A = 45 R=開方2
bi) 1 over (開方2) + 2< y<1 over 3
ii) 1-2y (y是bi的答案)
bi) 1 over (開方2) + 2< y<1 over 3
ii) 1-2y (y是bi的答案)
參考: 亂估
收錄日期: 2021-04-14 19:50:22
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