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この近似が分かりません💦🙇‍♂️

2 82 1- 2 = (1 + 02²) - r = 10².

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✨ Best Answer ✨

θが限りなく0に近い場合を考えると、
最初の項を有理化し、-θ^2/4を削除した
近似だと思います。

T

ありがとうございます!

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