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Let f:R to R be a continuous function an...

Let `f:R to R` be a continuous function and `f(x)=f(2x)` is true `AA x in R`. If f(1) = 3 then the value of `int_(-1)^(1) f(f(x))dx=`

A

6 or 2f(0)

B

0

C

3f(x)

D

3f(0)

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