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The value of 'a' for which the function ...

The value of 'a' for which the function f(x) =`a sin x+1/3 sin 3x` has an extremum at `x=pi//3` is

A

1

B

`-1`

C

0

D

2

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AAKASH SERIES-MAXIMA & MINIMA-EXERCISE-II
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