
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 $f(x)=\frac{1}{3}x^3+ax^2-3a^2x$.  
$(1)$ When $a=1$, find the maximum and minimum values of the function $f(x)$ on the interval $[0,2]$.  
$(2)$ If the function $f(x)$ has a local minimum on the interval $(1,2)$, find the range of real numbers for $a$.

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