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NSolve[2.56*Sqrt[x^2 - 2.25] == 3.14 + ArcTan[Sqrt[1.25]/Sqrt[x^2 - 2.25]], x]

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CODE:
Function 2.56*Sqrt(x^2 - 2.25) = 3.14 + ArcTan(Sqrt(1.25)/Sqrt(x^2 - 2.25));

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