What is the value of p for which the function\[f(x)=p\,\,\sin x+\frac{\sin 3x}{3}\]has an extremum at\[x=\frac{\pi }{3}\]?

What is the value of p for which the function\[f(x)=p\,\,\sin x+\frac{

1.	What is the value of p for which the function\[f(x)=p\,\,\sin x+\frac{\sin 3x}{3}\]has an extremum at\[x=\frac{\pi }{3}\]?
A.	0
B.	1
C.	-1
D.	2
Answer» E.

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What is the value of p for which the function\[f(x)=p\,\,\sin x+\frac{\sin 3x}{3}\]has an extremum at\[x=\frac{\pi }{3}\]?

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