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Question: How do I recall the original plot expression for a variable

Question:How do I recall the original plot expression for a variable

Christopher2222 5890 Maple
plot
March 19 2010
0

Suppose I set

a:=plot(x^2) or some other complicated expression, but just for simplicity sake

Then I go ahead fill up a worksheet then change the a to b in the same line and alter the expression for variable b (because I didn't want to type out a new line for the variable)

How do I recall what I've set a equal to? 

eval(a,1) - just returns the plot and    print(a,1) - returns PLOT(...),1

I think there's a way but I can't recall.  Can someone point me in the right direction?
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