
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 the planar vectors $\overrightarrow {a}$ and $\overrightarrow {b}$, where $\overrightarrow {a}$ = (2cosα, 2sinα) and $\overrightarrow {b}$ = (cosβ, sinβ), if the minimum value of $|\overrightarrow {a} - λ\overrightarrow {b}|$ for any positive real number λ is $\sqrt{3}$, calculate $|\overrightarrow {a} - \overrightarrow {b}|$.

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