
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 $\sin a = -\frac{4}{5}$ and $-\frac{\pi}{2} < a < 0$, find the value of $\sin 2a$. The options are:
A) $-\frac{24}{25}$
B) $-\frac{12}{25}$
C) $\frac{12}{25}$
D) $\frac{24}{25}$

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