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(a)
Find .
Observe the graph.
Left hand limit :
As tends to from left side, approaches to negative large number.
So .
Right hand limit :
As tends to from right side, approaches to negative large number.
So .
Left hand limit and right hand limit are equal, is exist.
.
(b)
Find .
Observe the graph.
Left hand limit :
As tends to from left side, approaches to positive large number.
So .
Right hand limit :
As tends to from right side, approaches to positive large number.
So .
Left hand limit and right hand limit are equal, is exist.
.
(c)
Find .
Observe the graph.
Left hand limit :
As tends to from left side, approaches to positive large number.
So .
Right hand limit :
As tends to from right side, approaches to positive large number.
So .
Left hand limit and right hand limit are equal, is exist.
.
(d)
Find .
Observe the graph.
As tends to from left side, approaches to negative large number.
So .
(e)
Find .
Observe the graph.
As tends to from right side, approaches to positive large number.
So .
(f)
Find the vertical asymptote.
Vertical asymptote :
The vertical asymptote is a line equation, toward which a function approaches to either positive or negative infinity.
Observe the graph.
As tends to from left side, approaches to negative large number.
So .
As tends to from left side, approaches to positive large number.
So .
As tends to from right side, approaches to positive large number.
So .
As tends to from left side, approaches to negative large number.
So .
From the above statements, it satisfies the definition of vertical asymptotes.
The vertical asymptotes are , , and .
(a) .
(b) .
(c) .
(d) .
(e) .
(f) The vertical asymptotes are , , and .
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