
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
If the vertex of angle \( \alpha \) coincides with the origin and its initial side coincides with the positive half-axis of the x-axis, and the terminal side lies on the ray \( 3x+4y=0 \) with \( x > 0 \), then \( \sin \alpha \) equals to ______.

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