
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 the function $f(x) = a\sin{3x} + bx^3 + 4$ ($a \in \mathbb{R}, b \in \mathbb{R}$), and $f'(x)$ is the derivative of $f(x)$, then $f(2014) + f(-2014) + f'(2015) - f'(-2015) = \_\_\_\_\_\_$.

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