
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
In the cartesian coordinate system xOy, point P is located at (1, $\sqrt {3}$). If $|$$\overrightarrow {OA}$$|=|$$\overrightarrow {OB}$$|=|$$\overrightarrow {OC}$$|=1, and $$\overrightarrow {OA}$$+ $$\overrightarrow {OB}$$+ $$\overrightarrow {OC}$$\= $$\overrightarrow {0}$$, determine the range of values for $$\overrightarrow {PB}$$• $$\overrightarrow {OA}$$.

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