
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 graph of the function f(x) = arcsin(x - 1) intersects the x-axis at point A, and the line l passing through point A intersects the graph of the function at two other points P and Q, with O being the origin of the coordinate system, then what is the value of $$( \overrightarrow {OP}+ \overrightarrow {OQ})\cdot \overrightarrow {OA}$$?

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