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The function f(x) = a sin x + 1/3 sin 3...

The function f(x) = a sin x + 1/3 sin 3x has a maximum value of `x = pi/3`. The value of a is

A

A.3

B

B. (1/3)

C

C. 2

D

D. (1/2)

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The correct Answer is:
C
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