
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 $ \dfrac {1}{|\sin \alpha|}=- \dfrac {1}{\sin \alpha} $, and $ \lg \cos \alpha $ is meaningful.  
(1) Determine the quadrant in which angle $ \alpha $ is located;  
(2) If a point on the terminal side of angle $ \alpha $ is $ M\left( \dfrac {3}{5},m\right) $, and $ |OM|=1 $ ($ O $ is the origin), find the value of $ m $ and the value of $ \sin \alpha $.

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