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灵活的三角函数公式变形题，考查两角和与差的三角函数二倍角等
天津一中2020届高三数学一月考第16题三角函数公式二倍角两角和与差的三角函数配角
新课程高考数学考题讲解及难重点分析，高三必备，免费视频合辑40/409
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