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I was just experimenting around with some derivatives and ended up coming across a function whose derivative is the same as the original function. I know that the derivative of e^x is e^x, but I didn't know it was possible for other functions to also follow this. I'm just wondering if this is a rare occurrence or if it's not really big deal.

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# B A function such that f(x)=f'(x)? (not e^x)

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