
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
To purify the water quality, a certain chemical is added to a swimming pool. The concentration C (in mg/L) of the chemical in the pool water changes with time t (in hours) according to the relationship C= $$\frac {20t}{t^{2}+4}$$. After \_\_\_\_\_\_ hours, the concentration of the drug in the pool water reaches its maximum.

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