ㅇㅇ(223.38)냥을 위한 선물~^ㅡ^♡

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달!

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https://m.dcinside.com/board/mathematics/343792

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고맙습니당 - dc App

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근데 |sinㅣ이랑 루트코사인제곱은 왜 마이너스 붙어서 나오나요?? - dc App

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새로 글 올렸어요~^ㅁ^♡

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https://m.dcinside.com/board/mathematics/343796

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래!

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빛

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