
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 one is \_\_\_\_ (fill in the number)

$①$ If $0 < α < \dfrac{\pi}{2}$, then $\sin α < \tan α;$

$②$ If $α$ is an angle in the second quadrant, then $\dfrac{α}{2}$ is an angle in the first or third quadrant;

$③$ If the terminal side of angle $α$ passes through point $P(3k,4k)(k \neq 0)$, then $\sin α= \dfrac{4}{5};$

$④$ If the perimeter of a sector is $6$, and its radius is $2$, then the size of its central angle is $1$ radian.

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