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Show that a^(x)+a^(-x) is an even functi...

Show that `a^(x)+a^(-x)` is an even function.

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Let `f(x)=a^(x)+a^(-x)`
Then `f(-x)=a^(-x)+a^(-(x))=a^(-x)+a^(x)=f(x)`. Hence `f(x)` is an even function
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