
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
Let $f(x) = \frac {e^{x}}{1+ax^{2}}$, where $a$ is a positive real number.
(I) If $a= \frac {4}{3}$, find the intervals of monotonicity for $f(x)$.
(II) If $f(x)$ is a monotonic function on $\mathbb{R}$, determine the range of values for $a$.

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