$$\( \mathrm{f}(x)=2 x-1 \quad \mathrm{~g}(x)=x^{2}+2 x \quad \mathrm{~h}(x)=4^{x} \quad \mathrm{j}(x)=2^{x}\)$$ Find the value of $$\(\mathrm{h}(3)\)$$, .............................................

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