
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 $\triangle ABC$, the sides opposite to angles $A$, $B$, $C$ are $a$, $b$, $c$ respectively, and they satisfy $(2a-c)\cos B=b\cos C$.
(I) Find the measure of angle $B$;
(II) Let $\overrightarrow{m}=(\sin A,1)$, $\overrightarrow{n}=(-1,1)$, find the minimum value of $\overrightarrow{m}\cdot \overrightarrow{n}$.

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