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Let `f: R->R` be a continuous function and `f(x)=f(2x)` is true `AAx in Rdot` If `f(1)=3,` then the value of `int_(-1)^1f(f(x))dx` is equal to (a)6 (b) 0 (c) `3f(3)` (d) `2f(0)`

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