
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 vectors $\overrightarrow {a}=(\cos x, \sin x)$ and $\overrightarrow {b}=(3, -\sqrt {3})$, where $x \in [0, \pi]$.
(1) Find the value of $x$ when $\overrightarrow {a} \parallel \overrightarrow {b}$.
(2) Let $f(x) = \overrightarrow {a} \cdot \overrightarrow {b}$. Find the maximum and minimum values of the function $y=f(x)$ and their corresponding $x$ values.

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