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数学
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若 sinA+cosA / 2sinA-cosA =2 ,则tanA=?
A.1 B.-1 C.3/4 D.-3/4
人气:453 ℃ 时间:2020-04-01 12:10:38
解答
sinA+cosA=4sinA-2cosA
sinA=cosA
所以tanA=sinA/cosA=1
选A
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