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数学
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已知tana=1/2,则cosa-sina/2cosa-sina
人气:387 ℃ 时间:2020-08-31 06:10:23
解答
cosa-sina/2cosa-sina
=(1-tana)/(2-tana) 分子分母同时除以cosa
=(1-1/2)/(2-1/2)
=1/3
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