
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given a triangle $\triangle ABC$ with its three internal angles $A$, $B$, $C$ and the opposite sides $a$, $b$, $c$ respectively, and it is known that $b^2+c^2=a^2+bc$. Find:  
(1) The value of $2\sin B \cos C - \sin(B - C)$;  
(2) If $a=2$, find the maximum value of the perimeter of $\triangle ABC$.

Present the answer in LaTex format: \boxed{Your answer}
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