What is the oblique asymptote of f(x)=2x3−x+1x2+1f(x) = \frac{2x^3 - x + 1}{x^2 + 1}f(x)=x2+12x3−x+1?
y=2xy = 2xy=2x
No oblique asymptote
y=xy = xy=x
y=2x−1y = 2x - 1y=2x−1