
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 $S\_n$ be the sum of the first $n$ terms of the sequence ${a\_n}$. Given that $a\_n > 0$ and $a\_n^{2}+2a\_n=4S\_n+3$,
(I) Find the general term formula for ${a\_n}$;
(II) Let $b\_n= \frac {1}{a\_n a_{n+1}}$, find the sum of the first $n$ terms of ${b\_n}$.

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