
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 triangle $\triangle ABC$ with sides $a$, $b$, $c$ opposite to angles $A$, $B$, $C$ respectively. If $\overrightarrow{BC} \cdot \overrightarrow{BA} + 2\overrightarrow{AC} \cdot \overrightarrow{AB} = \overrightarrow{CA} \cdot \overrightarrow{CB}$. <br/>$(1)$ Find the value of $\frac{{\sin A}}{{\sin C}}$; <br/>$(2)$ If $2a \cdot \cos C = 2b - c$, find the value of $\cos B$.

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