where A,B,C are integers!!!!!!!!!!!!
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2012-08-25 9:10 pm
rewrite 3sin^2x - sinxcosx - 1 = 0 in the from Atan^2x + BtanX + C = 0
where A,B,C are integers!!!!!!!!!!!!
where A,B,C are integers!!!!!!!!!!!!
回答 (1)
2012-08-25 9:16 pm
✔ 最佳答案
3sin²x - sinxcosx - 1 = 03sin²x - sinxcosx - (sin²x + cos²x) = 02sin²x - sinxcosx - cos²x = 0(2sin²x - sinxcosx - cos²x) / cos²x = 0 2 sin²x / cos²x - sinx cosx / cos²x - cos²x / cos²x = 02 tan²x - tanx - 1 = 02012-08-25 18:05:27 補充：
喂! 上次在qid=7012040500350你咁攪法,今次唔好喇啩~~
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