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tanA=2,1/(sin^2A-cos^2A)=
人气:478 ℃ 时间:2020-05-08 21:39:13
解答
tana=2
1/(sin^2a-cos^2a)
=(sin^2a+cos^2a)/(sin^2a-cos^2a)
=(tan^2a+1)/(tan^2a-1)
=(5)/(3)
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