どちらも大丈夫です
2^x = 2^(-x) 両辺に 2^x をかける
2^x × 2^x = 2^(-x) × 2^x
2^(x+x) = 2^(-x+x)
2^(2x) = 2^0
2^(2x) = 1
これでどうでしょう
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