2800
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Evaluate: $64^2-36^2$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
2800
Evaluate: $64^2-36^2$
train