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Let `f (x+y) = f (x). f (y)` for all x and y and f (1) = 2 . If in a triangle ABC, `a = f (3), b =f (1)+ f (3), c = f (2) + f (3),` then 2 A is equal to

A

C

B

2 C

C

3C

D

5C

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A
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