
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. Given $\overrightarrow{m}=(b,2a-c)$, $\overrightarrow{n}=(\cos B,\cos C)$, and $\overrightarrow{m} \parallel \overrightarrow{n}$:
1. Find the measure of angle $B$;
2. Let $f(x)=\cos (ωx- \frac {B}{2})+\sin ωx(ω > 0)$, and the smallest positive period of $f(x)$ is $π$, find the maximum and minimum values of $f(x)$ on the interval $[0, \frac {π}{2}]$.

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