【高校数学】　数Ⅱ－１２０　三角関数の合成③

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`cos^2alpha+cos^2(alpha+120^0)+cos^2(alpha-120^0)=3/2`

【数Ⅱ】三角関数と方程式 2　sinとcosの1次方程式【合成して三角関数の個数を減らす】

【15秒ゼミ】三角関数の合成による最大・最小とそのときの θ 　数学Ⅱ

【高校数学】　数Ⅱ－１１９　三角関数の合成②

三角関数の最大 〜sinとcosの2次式〜

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【裏技】三角関数の中身を簡単にずらす方法

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how to find cos120'

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