\(f(x)=\frac{a^x-a^{-x}}{a^x+a^{-x}}\)

Algebra Level 2

For \[f(x)=\frac{a^x-a^{-x}}{a^x+a^{-x}} ( a \neq 1, a>0),\] if \(f(k)=10,\) what is the value of \(f(2k)?\)

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