Simplify
\[4 \sin x \sin (60^\circ - x) \sin (60^\circ + x).\]The answer will be a trigonometric function of some simple function of $x,$ like "$\cos (2x)$" or "$\sin (x^3)$".
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Simplify
\[4 \sin x \sin (60^\circ - x) \sin (60^\circ + x).\]The answer will be a trigonometric function of some simple function of $x,$ like "$\cos (2x)$" or "$\sin (x^3)$".
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\sin 3x
Simplify
\[4 \sin x \sin (60^\circ - x) \sin (60^\circ + x).\]The answer will be a trigonometric function of some simple function of $x,$ like "$\cos (2x)$" or "$\sin (x^3)$".
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