已知A为锐角,且sinA-cosA/sinA+cosA=1/3,tanA=sinA/cosA,求tanA
人气：257 ℃ 时间：2020-06-20 05:50:39
解答
移项
sinA-cosA/sinA+cosA=1/3
3sinA-3cosA=sinA+cosA
2sinA=4cosA
∵tanA=sinA/cosA
∴tanA=2
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