
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 formula for the term \(a_n\) of the sequence \(\{a_n\}\);  
(II) Let \(b_n= \frac {1}{a_na_{n+1}}\), calculate the sum of the first \(n\) terms of the sequence \(\{b_n\}\).

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