
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
Stretch the abscissa of each point on the graph of the function $y=2\cos (4x-\frac{π}{3})+1$ to twice the original length, then shift it to the left by $\frac{π}{3}$ units without changing the ordinate, and find the equation of the axis of symmetry of the resulting function graph.

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