
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 an ellipse $C: \frac{x^2}{a^2}+\frac{y^2}{b^2}=1$ with $a > b > 0$ and an eccentricity of $\frac{\sqrt{3}}{3}$, a line passing through $F_2$ intersects the ellipse at points $A$ and $B$, and the perimeter of $\triangle AF_1B$ is $4\sqrt{3}$. Determine the equation of the ellipse.

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