
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
Given that $\cos(x+y) \cdot \sin x - \sin(x+y) \cdot \cos x = \frac{12}{13}$, and $y$ is an angle in the fourth quadrant, find the value of $\tan \frac{y}{2}$.

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