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Discuz Math Forum»Forum › Mathematics › High School › 一道三角求值题
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original poster: lemondian

[函数] 一道三角求值题

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lemondian

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original poster lemondian posted 2020-6-4 08:32
回复 19# 色k 60401.jpg
这个地方看得不太明白，能否解释一下？
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