
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 $\frac {π}{2}$＜α＜π, $\frac {π}{2}$＜β＜π, cosα=-$ \frac {3}{10}$$\sqrt {10}$, tanβ=-$ \frac {1}{2}$, find:

1. The value of sin(α - $\frac {5}{6}$π)
2. The value of α + β

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