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数学
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已知cos x/(sin x-1)=1/2,则(1+sin x)/cos x等于?
人气:257 ℃ 时间:2019-11-07 16:10:02
解答
1-sin²x=cosx²
(1+sinx)(1-sinx)=cos²x
所以(1+sinx)/cosx=cosx/(1-sinx)=1/2
所以cosx/(sinx-1)=-1/2
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