What is the Maclaurin series for f(x)=1+x+x2f(x) = 1+x+x^2f(x)=1+x+x2?
It is not a Maclaurin series.
1+x+x21+x+x^21+x+x2
∑n=0∞xn\sum_{n=0}^{\infty} x^n∑n=0∞xn
∑n=2∞xn\sum_{n=2}^{\infty} x^n∑n=2∞xn