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Home » チョークの置換をします：\(u = 3x - DNSFLEX

チョークの置換をします：\(u = 3x - DNSFLEX

📅 March 11, 2026 👤 scraface

Mar 11, 2026

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📌 Let $ x = 0 $: $ \sin^2 0 = 0 $, $ \cos^2 0 = 1 $, $ f(0) = 1 $. Formula: $ 1 - rac{1}{2}(1 - 1) = 1 $. Correct.

📌 $ x = rac{\pi}{2} $: $ \cos 2x = \cos \pi = -1 $, $ \cos 4x = \cos 2\pi = 1 $, so $ f(x) = 1 - rac{1}{2}(-1 - 1) = 1 - rac{1}{2}(-2) = 1 + 1 = 2 $. Correct.

📌 But earlier we said $ f(x) = 1 - rac{1}{2}(\cos 2x - \cos 4x) $. When $ \cos 2x = -1 $, $ \cos 4x = 1 $, so $ -1 - 1 = -2 $, multiplied by $ -rac{1}{2} $ gives $ +1 $, so $ 1 + 1 = 2 $. Yes.

📌 But we want **minimum**, not maximum. Can $ f(x) $ be less than 1?

📌 Try $ x = rac{\pi}{4} $: $ \sin^2 x = \left(rac{\sqrt{2}}{2}

📌 ight)^2 = rac{1}{2} $, $ 2x = rac{\pi}{2} $, $ \cos^2(2x) = \cos^2(rac{\pi}{2}) = 0 $, so $ f = 0.5 + 0 = 0.5 $.

📌 But according to formula: $ f\left(rac{\pi}{4}

📌 ight) = 1 - rac{1}{2}(\cos rac{\pi}{2} - \cos \pi) = 1 - rac{1}{2}(0 - (-1)) = 1 - rac{1}{2}(1) = 0.5 $. Correct.

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