# Science:Math Exam Resources/Courses/MATH100/December 2015/Question 10 (c)/Hint 1

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If or , then the horizontal line is a horizontal asymptote of the function.

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If $\lim _{x\to +\infty }f(x)=c$ or $\lim _{x\to -\infty }f(x)=c$, then the horizontal line $y=c$ is a horizontal asymptote of the function.