Find the value of $\sqrt{12-\!\sqrt{12-\!\sqrt{12-\cdots}}}$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Find the value of $\sqrt{12-\!\sqrt{12-\!\sqrt{12-\cdots}}}$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
3
Find the value of $\sqrt{12-\!\sqrt{12-\!\sqrt{12-\cdots}}}$.
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