Infinite Limits At Infinity

Infinite Limits At Infinity Limit at Infinity Infinite Limit and Basic Functions Find the following limits by observing the behaviour of the graph of each function ds lim x to infty frac 6 sqrt x 3 ds lim x to infty left x x 2 right ds lim x to infty left x 3 x right ds lim x to infty cos x ds lim x to infty e x

In this section we define limits at infinity and show how these limits affect the graph of a function We begin by examining what it means for a function to have a finite limit at infinity Then we study the idea of a function with an infinite limit at infinity We cannot actually get to infinity but in limit language the limit is infinity which is really saying the function is limitless We have seen two examples one went to 0 the other went to infinity In fact many infinite limits are actually quite easy to work out when we figure out which way it is going like this

Infinite Limits At Infinity

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Infinite limits What do we mean by an infinite limit Sometimes the values of a function become unbounded in the positive or negative direction as x approaches a certain value In such cases we talk about the function having an infinite limit at that value of x For functions defined as fractions or quotients this happens when the denominator becomes 0 for Define a horizontal asymptote in terms of a finite limit at infinity Evaluate a finite limit at infinity by initially performing algebraic manipulations Conceptually investigate an infinite limit at infinity Describe when the Limit Laws cannot be applied

In this section we will start looking at limits at infinity i e limits in which the variable gets very large in either the positive or negative sense We will concentrate on polynomials and rational expressions in this section We ll also take a In this section we will take a look at limits whose value is infinity or minus infinity These kinds of limit will show up fairly regularly in later sections and in other courses and so you ll need to be able to deal with them when you run across them

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Today we will learn how to talk rigorously about horizontal and oblique asymptotes For this we will need a new type of limits Definition A function f is said to have the limit L as x tends to if the values f x get as close as we like to L as x increases without bound In this case one writes In this section we define limits at infinity and show how these limits affect the graph of a function We begin by examining what it means for a function to have a finite limit at infinity Then we study the idea of a function with an infinite limit at infinity

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