Hi,

When I use substitution to find the power series of e^(-x^2) at x=0, I get 1-x^2+x^4/2!-x^6/3!+...

However, when I take the derivative of e^(-x^2) directly, I get: 1-2x^2+12x^4/2!-...

Can anyone tell me why this is the case? Did I do the derivative wrong?

Thanks in advance