What are the first four non-zero terms of the Maclaurin series for f(x)=ex2f(x) = e^{x^2}f(x)=ex2?
1+x+x2+x33!1 + x + x^2 + \frac{x^3}{3!}1+x+x2+3!x3
1+x2+x42!+x63!1 + x^2 + \frac{x^4}{2!} + \frac{x^6}{3!}1+x2+2!x4+3!x6
x2+x42!+x63!+x84!x^2 + \frac{x^4}{2!} + \frac{x^6}{3!} + \frac{x^8}{4!}x2+2!x4+3!x6+4!x8
1+x2+x4+x61 + x^2 + x^4 + x^61+x2+x4+x6