
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 restricted to $$\{-3\pi/2, -\pi, -\pi/2, 0, \pi/2, \pi, 3\pi/2\}$$. Identify the product of the labels of the functions which are invertible.
- Function (2) is defined by the cubic equation $y = x^3 - 3x$.
- Function (3) consists of discrete points $\{(1,2), (2,4), (3,6)\}$.
- Function (4) is the trigonometric function $y = \sin(x)$.
- Function (5) is the rational function $y = 1/x$.

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