
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
The graphs of four functions, labelled (2) through (5), are shown below. Note that the domain of function (4) is $$\{-6,-4,-2,0,2,4,6\}.$$ Find the product of the labels of the functions which are invertible. Among these functions:
- Function (2) is represented by a cubic polynomial $y = x^3 - 3x$.
- Function (3) consists of discrete points $\{(-6,5), (-4,3), (-2,1), (0,-1), (2,-3), (4,-5), (6,-7)\}$.
- Function (4) is a trigonometric function $y = \sin(x)$ with a limited domain.
- Function (5) is a rational function $y = \frac{1}{x}$.

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