
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
\(11 f(x)\) is an even function defined on \(\mathbf{R}\), and \(f(1+x) = f(1-x)\), \(f(x)\) is monotonically increasing on the interval \((0,1)\). Determine the relationship between \(f(8.5)\) and \(f(-4.8)\).

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