
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 a point $P(7m, -3m)$ ($m \neq 0$) on the terminal side of angle $\alpha$,

(1) Find the value of $\frac{\cos (\frac{\pi }{2}+\alpha)\sin (-\pi -\alpha)}{\cos (\frac{11\pi }{2}-\alpha)\sin (\frac{9\pi }{2}+\alpha)}$;

(2) Find the value of $2+\sin \alpha \cos \alpha-\cos ^{2}\alpha$.

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