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数学
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若sinx+sin^2x=1,则cos^2x-sinX=?
急
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人气:414 ℃ 时间:2020-01-27 04:27:50
解答
解因为sin^2x+cos^2x=1,
sinx+sin^2x=1
所以cos^2x=sinx
所以cos^2x-sinX=sinx-sinx=0
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