
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
Among the following conclusions, the correct conclusion number is ______.  
① The function $y=\sin(k\pi-x)$ ($k\in\mathbb{Z}$) is an odd function;  
② If $\tan(\pi-x)=2$, then $cos^{2}x= \frac{1}{5}$;  
③ The graph of the function $y=\tan(2x+ \frac{\pi}{6})$ is symmetric about the point $(\frac{\pi}{12},0)$;  
④ The graph of the function $y=\cos(2x+ \frac{\pi}{3})$ has a line of symmetry at $x=- \frac{2\pi}{3}$.

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