Best. Joke. Ever.

x and e^x were walking down the street when they saw a derivative up ahead.

"Oh, no!" cried x, "I've got to get out of here; that derivative will do me in for sure!" and ran off, fearing for his life.

But e^x just smiled smugly to himself and thought "Ha, I'm e^x, that derivative can't do anything to me." So he walked right up to the derivative and said "Hi, I'm e^x!"

The derivative smiled back and said "Hi, I'm partial/partial y."

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