$$\[ \mathrm{f}(x)=4 x-1 \quad \mathrm{~g}(x)=x^{2} \quad \mathrm{~h}(x)=3^{-x} \]$$ Find $$\(\mathrm{f}^{-1}(x)\)$$. $$\[ f^{-1}(x)= ............................................. \]$$

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