a.
Find the domain of the function.
a.

Answer to Problem 87E
R−{0}
Explanation of Solution
Given information:
Consider the function f(x)=sinxx and its graph, shown in the figure below,
Calculation:
Consider the function,and graph,
f(x)=sinxx
put,x=0y=sinxxy=sin00=00=0
This is not defined , function f is defined everywhere except x=0
Hence, the domain of the function is, R−{0}
b.
Identify any symmetry and any asymptotes of the graph.
b.

Answer to Problem 87E
y−axis
Explanation of Solution
Given information:
Consider the function f(x)=sinxx and its graph, shown in the figure below,
Calculation:
Consider the function,and graph,
f(x)=sinxx
The graph has no asymptotes because it does not approach to a particular value,
For symmetry replace x to −x
f(−x)=sin(−x)−x=−sinx−x=sinxx
Which is equal to f(x) means the function is even and symmetrical about y−axis .
Hence the function is symmetrical about y−axis
c.
Describe the behaviour of the function as x→0 .
c.

Answer to Problem 87E
f(x)=sinxx→1
Explanation of Solution
Given information:
Consider the function f(x)=sinxx and its graph, shown in the figure below,
Calculation:
Consider the function,and graph,
f(x)=sinxx
According to the graph x→0 then function f(x)=sinxx→1
Hence, the behaviour of the function as x→0 is f(x)=sinxx→1
d.
Find the number of solutions.
d.

Answer to Problem 87E
4 , −π,−2π,π,2π
Explanation of Solution
Given information:
Consider the function f(x)=sinxx and its graph, shown in the figure below,
How many solutions does the equation sinxx=0 have in the interval [−8,8] ? Find the solutions.
Calculation:
Consider the function,and graph,
f(x)=sinxx
The function f(x)=sinxx is equal to zero only when sinx=0 and x≠0
So x=0 is not the not the solution of function,
Now with maple the graph of f(x)=sinxx in the interval [−8,8] will be,
The function cuts the x−axis
4 times,
Hence, the solutions are 4 which are −π,−2π,π,2π
Chapter 5 Solutions
EBK PRECALCULUS W/LIMITS
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