
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 that \( f(x) \) is an even function defined on \( \mathbb{R} \), and for any \( x \in \mathbb{R} \), \( f(x+6) = f(x) \), and \( f(4) = 5 \), determine the value of \( f(2018) \).

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