Calculus
limx→∞f(x)\lim_{x\rightarrow\infty}f\left(x\right) =15=\frac15
limx→−∞f(x)\lim_{x\rightarrow-\infty}f\left(x\right) =15=\frac15
Horizontal asymptote: y=15y=\frac15y=51
limx→−∞f(x)\lim_{x\rightarrow-\infty}f\left(x\right) =−15=-\frac15
Horizontal asymptotes: y=5y=5 and y=−5y=-5
limx→∞f(x)\lim_{x\rightarrow\infty}f\left(x\right) =13=\frac13
limx→−∞f(x)\lim_{x\rightarrow-\infty}f\left(x\right) =−13=-\frac13
Horizontal asymptotes: y=3y=3 and y=−3y=-3
limx→−∞f(x)\lim_{x\rightarrow-\infty}f\left(x\right) =13=\frac13
No horizontal asymptote