
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 the focal length, the length of the minor axis, and the length of the major axis of an ellipse form an arithmetic sequence, determine the eccentricity of the ellipse.

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