
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 angles $α$ and $β$ whose vertices are at the origin of coordinates, and their initial sides coincide with the positive half-axis of $x$, $α$, $β$ $\in(0,\pi)$, the terminal side of angle $β$ intersects the unit circle at a point whose x-coordinate is $- \dfrac{5}{13}$, and the terminal side of angle $α+β$ intersects the unit circle at a point whose y-coordinate is $ \dfrac{3}{5}$, then $\cos α=$ ______.

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