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limx→∞f(x)=∞\lim_{x\to\infty}f\left(x\right)=\inftylimx→∞f(x)=∞
limx→∞f(x)\lim_{x\to\infty}f\left(x\right)limx→∞f(x) does not exist
limx→5f(x)=3\lim_{x\to5}f\left(x\right)=3limx→5f(x)=3
limx→3f(x)=5\lim_{x\to3}f\left(x\right)=5limx→3f(x)=5
It is done.