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Example Questions
Example Question #254 : Indefinite Integrals
To find this integral, look at each term separately.
For the first term, raise the exponent by 1 and also put that result on the denominator: .
For the next term, do the same: .
Same for the third term (since it's a constant, multiply the coefficient by x): .
Put those all together to get: . Since this is an indefinite integral, make sure to add C at the end:
.
Example Question #255 : Indefinite Integrals
First chop up the fraction into two separate terms and simplify: .
Now, integrate that expression. Remember to raise the exponent by 1 and also put that result on the denominator:
Since it's an indefinite integral, remember to add C at the end: .
Example Question #531 : Finding Integrals
Evaluate:
The integral does not converge
, so
Example Question #1 : Improper Integrals
Evaluate:
First, we will find the indefinite integral using integration by parts.
We will let and
.
Then and
.
To find , we use another integration by parts:
, which means that
, and
, which means that, again,
.
Since
, or,
for all real , and
,
by the Squeeze Theorem,
.
Example Question #1 : Improper Integrals
Evaluate:
The integral does not converge
First, we will find the indefinite integral, .
We will let and
.
Then,
and
.
and
Now, this expression evaluated at is equal to
.
At it is undefined, because
does not exist.
We can use L'Hospital's rule to find its limit as , as follows:
and
, so by L'Hospital's rule,
Therefore,
Example Question #881 : Integrals
Evaluate:
The integral does not converge.
First, we will find the indefinite integral
using integration by parts.
We will let and
.
Then and
.
Also,
.
To find , we can substitute
for
. Then
or
, so the antiderivative is
.
Now we can integrate by parts:
By L'Hospital's rule, since both the numerator and the denominator approach as
,
.
So:
Example Question #531 : Finding Integrals
Evaluate:
Rewrite the integral as
.
Substitute . Then
and
. The lower bound of integration stays
, and the upper bound becomes
, so
Since , the above is equal to
.
Example Question #883 : Integrals
Evaluate:
The integral does not converge.
The integral does not converge.
Substitute .
The lower bound of integration becomes ;
the upper bound becomes .
The integral therefore becomes
The integral, therefore, does not converge.
Example Question #884 : Integrals
Evaluate the improper integral:
The integral does not converge.
First, we will perform an integration by parts on the indefinite integral:
Let and
.
Then,
,
,
and
.
We do another integration by parts, setting
and
.
Then,
and
.
Also,
and, again,
.
Therefore, the antiderivative of is
.
, which two applications of L'Hospital's rule can easily reveal.
Therefore,
.
Example Question #881 : Integrals
Evaluate the improper integral:
The integral does not converge.
First, we will perform an integration by parts on the indefinite integral
.
Let and
.
Then,
and
.
Also,
.
Therefore,
The antiderivative of is
and
.
, as can be proved by L'Hospital's rule.
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