长方形妙证三角函数的转化

Math Online Tom Circle

【思路清奇：长方形妙证三角函数的转化！】

https://m.ixigua.com/video/6950301018206765604/?app=video_article&timestamp=1618444826&utm_source=native_share&utm_medium=android&utm_campaign=client_share

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Author: tomcircle

Math amateur

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