点（sina-cosa,tana）在第一象限,则在【0,2派】内的a的取值范围是?
点（sina-cosa,tana）在第一象限,则在【0,2派】内的a的取值范围是?
数学人气：867 ℃时间：2020-03-27 19:26:20
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拍/4,pai
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