maths!!!!!!
回答 (1)
2008-01-03 6:51 am
✔ 最佳答案
5sin²θ+3sinθcosθ=1Dividing by cos²θ,
5tan²θ + 3tanθ - sec²θ = 0
5tan²θ + 3tanθ -1 - tan²θ = 0
4tan²θ + 3tanθ - 1 = 0
( 4tanθ - 1 )( tanθ + 1 ) = 0
tanθ = 1 / 4 or -1
參考: My Maths Knowledge
收錄日期: 2021-04-23 20:39:20
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https://hk.answers.yahoo.com/question/index?qid=20080102000051KK04339