
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
Simplify the following expressions:
(1) $3a(a+1) - (3+a)(3-a) - (2a-1)^2$
(2) $\left( \frac{x^2 - 2x + 4}{x - 1} + 2 - x \right) \div \frac{x^2 + 4x + 4}{1 - x}$.

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