
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 that \( O \) is the circumcenter of \(\triangle ABC\), where \(|AB|=2\), \(|AC|=1\), and \(\angle BAC = \frac{2}{3} \pi\). Let \(\overrightarrow{AB} = \mathbf{a}\) and \(\overrightarrow{AC} = \mathbf{b}\). If \(\overrightarrow{AO} = \lambda_1 \mathbf{a} + \lambda_2 \mathbf{b}\), find \(\lambda_1 + \lambda_2\).

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