
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
In the rectangular coordinate system xOy, the vertices of angles α and β coincide with the origin, and their initial sides coincide with the non-negative semi-axis of the x-axis. Their terminal sides intersect the unit circle at points A and B, respectively. If the coordinates of points A and B are ( $\frac {3}{5}， \frac {4}{5}$) and ($- \frac {4}{5}， \frac {3}{5}$), respectively, find the value of sin(α+β).

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