Define the functions \(f(x)\) and \(g(x)\) such that \(f(x)=2x\) and \(g(x)=\sqrt{x+3}\). For all \(x\) such that \(x\geq -3\), which of the following expressions is equal to \(f(g(x))\) ?

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$$ f(x) = 2x $$ $$ f(g(x)) = 2(\sqrt{x+3}) $$ $$ =\boxed{2\sqrt{x+3}} $$