
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 $f(x)=e^{x}-x^{2}-ax$.  
(I) If the tangent line of the graph of the function $f(x)$ at $x=0$ is $y=2x+b$, find the values of $a$ and $b$;  
(II) If the function $f(x)$ is increasing on $\mathbb{R}$, find the maximum value of the real number $a$.

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