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Assuming function of one variable...

Want y[x] s.t. y''[x] =y[x]

The characteristic equation is r^2 = 1.

r = (+/-) 1

So, e^(x*1) and e^(x * -1) work. To get full generality, multiply them by any constants A,B and add.

y[x] = A e^x + B e ^(-x)

y'[x] = A e^x - B e ^(-x)

y''[x] = A e^x + B e ^(-x) = y[x]

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Q: What is a function that is equal to twice its derivative?
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