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半角の公式を歌で暗記！｜sinは− cosは＋ tanは＋分の− 高校数学公式ソング #数学03
高校数学の三角関数「半角の公式」を、歌で覚える暗記ソングです。 今回のテーマは数学03「半角の公式」。 sin²(A/2) = (1 - cosA) / 2 cos²(A/2) = (1 + cosA) / 2 tan²(A/2) = (1 - cosA) / (1 + cosA) 覚え方のポイントは、 sinはマイナス cosはプラス tanはプラス分のマイナス ...
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