
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
(1) Evaluate the expression: $\sin ^{2}120^{\circ}+\cos 180^{\circ}+\tan 45^{\circ}-\cos ^{2}(-330^{\circ})+\sin (-210^{\circ})$;
(2) Find the monotonic intervals of the function $f(x)=( \frac {1}{3})^{\sin x}$.

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