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(3−√3)^2=3^2+3−6√3
=12−6√3
cos135°=−1/√2
−2×(3−√3)×√6cos135°=2√3(√3−1)×√3
=6(√3−1)
どうでしょうか?

nana

ありがとうございます!
できました🙏

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