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含60°角的菱形纸片，将锐角顶点折向对边中点，求角的余弦值？
含60°角的菱形纸片，将锐角顶点折向对边中点，求角的余弦值？
中考数学真题汇编8/15
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App06:41含60°角的菱形纸片，将锐角顶点折向对边中点，求角的余弦值？
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