$ \displaystyle\lim_{x \to 2^+} 3^{\frac{1}{2-x}} = $
poniamo t = 2 - x; se x → 2⁺ allora t → 0⁻
$ = \displaystyle\lim_{t \to 0^-} 3^{\frac{1}{t}} = 3^{-\infty} = 0$
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