
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
In $\triangle ABC$, $a$, $b$, $c$ are the sides opposite to angles $A$, $B$, $C$ respectively, and $b^{2}+c^{2}-a^{2}=bc$.
(I) Find the measure of angle $A$;
(II) Given $a=2$, let $f(x)= \sqrt {3}\sin \frac {x}{2}\cos \frac {x}{2}+\cos ^{2} \frac {x}{2}$. When $x=B$, $f(x)$ reaches its maximum value. Find the area of $\triangle ABC$.

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