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The minimum value of the expression 3^(x...

The minimum value of the expression `3^(x)+3^(-1-x),x in R` is `a sqrt(b)` then `a+ b=`( where `a, b` are in lowest form)

A

0

B

`(1)/(3)`

C

3

D

`2sqrt(3)`

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The correct Answer is:
D
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