Let f:R rarr R be such that for all x in...

Let `f:R rarr R` be such that for all `x in R(2^(1+x)+2^(1- x))',f(x)` and `(3^(x)+3^(-x))` are in A.P.,then the minimum value of `f(x)` is
`a)`2
`b)`0
`c)`3
`d)`4

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