Question #1300278

# Find all relative extrema of the function f(x)=-xsquare root of 3+2cosx?

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I don't even know how to start this problem off. I need steps, please.
My choices are
A- relative maxima at x=pi/4+2pin, rel. min. at x=5pi/4+2pin, for any integer n
B-relative maxima at x=pi/3+2pin, rel. min. at x=4pi/3+2pin, for any integer n
C-relative maxima at x=4pi/3+2pin, rel. min. at x=5pi/3+2pin, for any integer n
D- none of these
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TELL US , if you have any answer