$$\sqrt[ { x }^{ 2 } -1 ]{ 243 } \times \sqrt[ x-1 ]{ 9 } - \sqrt[ x-1 ]{ 27 }$$
$9^{\frac{1}{x-1}}\left(243^{\frac{1}{x^{2}-1}}-3^{\frac{1}{x-1}}\right)$
$$\left(3^{\frac{1}{x-1}}\right)^{2}\left(\left(3^{\frac{1}{x^{2}-1}}\right)^{5}-3^{\frac{1}{x-1}}\right)$$
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