Range of the function \( f(x)=\log _{2}\left(\frac{4}{\sqrt{x+2}+\sqrt{2-x}}\right) \) is :  

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Range of the function \( f(x)=\log _{2}\left(\frac{4}{\sqrt{x+2}+\sqrt{2-x}}\right) \) is :
 
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