
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 point $P$ with rectangular coordinates undergoes a scaling transformation $ \begin{cases} x'=2x \\ y'= \sqrt {3}y\\ \end{cases}$ and becomes point $P'(6,-3)$, find the polar coordinates of point $P$ when $ρ > 0$, $0 \leqslant θ < 2π$.

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