COMP 2711 Ex 17

1

a

$$n=4$$

b

$$n=5$$

c

$$\begin{array}{rl}f(x)& =\frac{x^4+x^2+1}{x^4+1}\\ & =\frac{1+\frac{1}{x^2}+\frac{1}{x^4}}{1+\frac{1}{x^4}}\end{array}$$ $$n=0$$

d

$$n=-1$$