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Let `f(x)` be a periodic function with period `int_0^x f(t+n) dt 3 and f(-2/3)=7 and g(x) =` .where `n=3k, k in N`. Then `g'(7/3) =`

A

`-2/3`

B

7

C

-7

D

`7/3`

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The correct Answer is:
B
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