
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 $f(x)= \begin{cases} x^3-1, x\geq 0\\ 2^x, x<0 \end{cases}$, and $f(0)=a$, find $f(a)=($    $)$.
A) $-2$
B) $-1$
C) $\frac{1}{2}$
D) $0$

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