
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
If \( f(x) = \log \left(\frac{1+x}{1-x}\right) \) for \( -1 < x < 1 \), then find \( f\left(\frac{4x+x^5}{1+4x^4}\right) \) in terms of \( f(x) \).
**A)** \( 2f(x) \)  
**B)** \( 3f(x) \)  
**C)** \( 4f(x) \)  
**D)** \( 5f(x) \)

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