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式変形をどうやったらこうなるのか教えてほしいです

k 2mg m k m -(1-1)}= k (1-1₁) sin 00 + (1-1) - sin 0 mg oof m²gamia k² 040 sin 20, + (1-1) 2} 犬の

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✨ Best Answer ✨

(a-b)²=a²-2ab+b²のa,bをa=(l-l₁),b=mg(sinθ₀)/kとみなして計算しています

s

ありがとうございます!

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