基礎問2b 演習問題57番 和積・積和の公式
Synopsis
基礎問 #基礎問題精講 #基礎門 #三角関数 #和積の公式 #積和の公式 #２倍角の公式 #東大生.
![Addition and Product Formula [High School Mathematics] Trigonometric Functions #29](https://i.ytimg.com/vi/yQYRXpWnKSY/hq720.jpg?sqp=-oaymwEcCNAFEJQDSFXyq4qpAw4IARUAAIhCGAFwAcABBg==&rs=AOn4CLB9lrdBXRERuNAJZeCTJkIEZ2z4RQ)
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