
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 $C:\dfrac{x^2}{a^2}+\dfrac{y^2}{b^2}=1 (a > b > 0)$ with semi-focal distance $c$, and the distance from the origin $O$ to the line passing through the points $(c,0)$ and $(0,b)$ is $\dfrac{c}{2}$, calculate the eccentricity of the ellipse.

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