
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 $f(x)=2x^{3}-3(a+1)x^{2}+6ax$, where $a > \frac{1}{2}$.
(I) If the function $f(x)$ takes an extreme value at $x=3$, find the equation of the tangent line to the curve $y=f(x)$ at the point $(0,f(0))$.
(II) If the minimum value of the function $y=f(x)$ on the interval $[0,2a]$ is $-a^{2}$, find the value of $a$.

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