1.

Let a function is defined as f(x)=(a^(x)+a^(-x))/(2), a gt 0, what is the value of f(x+y)+f(x-y)?

Answer»

`f(x)+f(y)`
`f(x)f(y)`
`2F(x)f(y)`
`4f(x)f(y)`

Answer :C


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