
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: $\sin (-90^{\circ})+3\cos 0^{\circ}-2\tan 135^{\circ}-4\cos 300^{\circ}$.
(2) Given that $\tan \theta= \frac {4}{3}$, where $\theta \in (0, \frac {\pi}{2})$. Find the value of $\sin \theta-\cos \theta$.

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