
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 $ABC$, let the sides opposite angles $A$, $B$, and $C$ be $a$, $b$, and $c$, respectively. It is given that $2b\cos C=2a- \sqrt {3}c$.

(1) Determine the measurement of $\angle B$.

(2) If $\overrightarrow{CA}+ \overrightarrow{CB}=2 \overrightarrow{CM}$ and $| \overrightarrow{CM}|=1$, find the maximum possible area of triangle $ABC$.

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