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                    LIMITS  

Properties of Limits
If b and c are real numbers, n is a positive integer, and the functions ? and g have limits as , then the following properties are true.
1. Scalar multiple: [b(?(x))] = b[?(x)]
2. Sum or difference: [?(x)g(x)] = ?(x)g(x)
3. Product: [?(x)g(x)] = [?(x)][g(x)]
4. Quotient: [?(x)/g(x)] = [?(x)]/[g(x)], if g(x)0
One-Sided Limits
?(x) x approaches c from the right
?(x) x approaches c from the left
Limits at Infinity
?(x) = L
or
?(x) = L
The value of ?(x) approaches L as x increases/decreases without bound.
y = L is the horizontal asymptote of the graph of ?.
Some Nonexistent Limits
sin
Some Infinite Limits
ln x
Exercise: What is ?
(A) 1
(B) 0
(C)
(D)
(E) The limit does not exist. /TD>
The answer is A. You should memorize this limit.
Continuity
Definition
A function ? is continuous at c if:
1. ?(c) is defined
2. ?(x) exists
3. ?(x) = ?(c)
Graphically, the function is continuous at c if a pencil can be moved along the graph of ?(x) through (c, ?(c)) without lifting it off the graph.
Exercise: If for x 0
and if ? is continuous at x = 0, then k =
(A) -3/2
(B) -1
(C) 0
(D) 1
(E) 3/2
The answer is E. ?(x) = 3/2
Intermediate Value Theorem
If ? is continuous on [a, b] and k is any number between ?(a) and ?(b), then there is at least one number c between a and b such that ?(c) = k.

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