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  5. 回答においてなぜcos2θがないのですか？🙄
Mathematics
Senior High
FUMI
FUMI

回答においてなぜcos2θがないのですか？🙄

(7) cos 十 cos 2 La
H - 0 、() cos9, cos36 で Cos 0 十 cos 39 ニー
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