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=> (3^x + 1/(3^x))^2 = 9^x + 2 + 1/(9^x)
=> (3^x + 1(3^x))^2 = 9^x + 1/(9^x) + 2
=> (3^x + 1/(3^x))^2 = 16 + 2
=> 3^x + 1/(3^x) = √18 = 3√2