三角関数

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2倍角の公式・半角の公式についてわかりやすく解説【受験に役立つ数学ⅡB】

みなさん、こんにちは。数学ⅡBのコーナーです。今回のテーマは【2倍角の公式】【半角の公式】です。気を落とすのはまだ早いです。前回、加法定理の解説でお伝えしたとおり、三角関数で覚えなくてはいけない公式は加法定理までです。すなわち、今回勉...

練習問題を解いて三角比の相互関係をマスターしよう【受験に役立つ数学ⅡB】

みなさん、こんにちは。数学ⅡBのコーナーです。今回のテーマは【三角比の相互関係】です。前回、たかしくんの言うとおり「三角比は円の座標を表現する」ということから、三角比の相互関係を表す4つの式を導きました。今回のゴールは、三角比の相互関係...

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