
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
In rectangle \(ABCD\), \(AB = a\), \(BC = b\), and \(M\) is the midpoint of \(BC\). Line \(DE\) is perpendicular to the ray \(AM\) at point \(E\). Find the length of \(DE\) in terms of \(a\) and \(b\).

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