
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 the terminal side of angle $x$ passes through point $P(-1, 3)$  
(1) Find the value of $\sin x + \cos x$  
(2) Find the value of $$\frac {\sin( \frac {\pi}{2} + x)\cos( \frac {\pi}{2} - x)}{\cos(-x)\cos(\pi - x)}$$.

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