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- Improper integral
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How to use it?
- Integral of d{x}:
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Integral of sin²xcos²x
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Integral of ex^2
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Integral of -e^x
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Integral of (1+2x^2)/(x^2(1+x^2))
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Identical expressions
- (x- one)/(x^ two +2x+ three)
- (x minus 1) divide by (x squared plus 2x plus 3)
- (x minus one) divide by (x to the power of two plus 2x plus three)
- (x-1)/(x2+2x+3)
- x-1/x2+2x+3
- (x-1)/(x²+2x+3)
- (x-1)/(x to the power of 2+2x+3)
- x-1/x^2+2x+3
- (x-1) divide by (x^2+2x+3)
- (x-1)/(x^2+2x+3)dx
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Similar expressions
- (x-1)/(x^2+2x-3)
- (x-1)/(x^2-2x+3)
- (x+1)/(x^2+2x+3)
Integral of (x-1)/(x^2+2x+3) dx
The solution
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[src]
1 / | | x - 1 | ------------ dx | 2 | x + 2*x + 3 | / 0
$$\int\limits_{0}^{1} \frac{x - 1}{\left(x^{2} + 2 x\right) + 3}\, dx$$
Integral((x - 1)/(x^2 + 2*x + 3), (x, 0, 1))
Detail solution
We have the integral:
/ | | x - 1 | ------------ dx | 2 | x + 2*x + 3 | /
Rewrite the integrand
/ 2*x + 2 \
|------------| /-2 \
| 2 | |---|
x - 1 \x + 2*x + 3/ \ 2 /
------------ = -------------- + ------------------------
2 2 2
x + 2*x + 3 / ___ ___\
|-\/ 2 \/ 2 |
|-------*x - -----| + 1
\ 2 2 / or
/ | | x - 1 | ------------ dx | 2 = | x + 2*x + 3 | /
/
|
| 2*x + 2
| ------------ dx
| 2
| x + 2*x + 3 /
| |
/ | 1
------------------ - | ------------------------ dx
2 | 2
| / ___ ___\
| |-\/ 2 \/ 2 |
| |-------*x - -----| + 1
| \ 2 2 /
|
/ In the integral
/
|
| 2*x + 2
| ------------ dx
| 2
| x + 2*x + 3
|
/
------------------
2 do replacement
2 u = x + 2*x
then
the integral =
/
|
| 1
| ----- du
| 3 + u
|
/ log(3 + u)
----------- = ----------
2 2 do backward replacement
/
|
| 2*x + 2
| ------------ dx
| 2
| x + 2*x + 3
| / 2 \
/ log\3 + x + 2*x/
------------------ = -----------------
2 2 In the integral
/ | | 1 - | ------------------------ dx | 2 | / ___ ___\ | |-\/ 2 \/ 2 | | |-------*x - -----| + 1 | \ 2 2 / | /
do replacement
___ ___
\/ 2 x*\/ 2
v = - ----- - -------
2 2 then
the integral =
/ | | 1 - | ------ dv = -atan(v) | 2 | 1 + v | /
do backward replacement
/ | / ___ ___\ | 1 ___ |\/ 2 x*\/ 2 | - | ------------------------ dx = -\/ 2 *atan|----- + -------| | 2 \ 2 2 / | / ___ ___\ | |-\/ 2 \/ 2 | | |-------*x - -----| + 1 | \ 2 2 / | /
Solution is:
/ 2 \ / ___ ___\
log\3 + x + 2*x/ ___ |\/ 2 x*\/ 2 |
C + ----------------- - \/ 2 *atan|----- + -------|
2 \ 2 2 /
The answer (Indefinite)
[src]
/ | / 2 \ / ___ \ | x - 1 log\3 + x + 2*x/ ___ |\/ 2 *(1 + x)| | ------------ dx = C + ----------------- - \/ 2 *atan|-------------| | 2 2 \ 2 / | x + 2*x + 3 | /
$$\int \frac{x - 1}{\left(x^{2} + 2 x\right) + 3}\, dx = C + \frac{\log{\left(x^{2} + 2 x + 3 \right)}}{2} - \sqrt{2} \operatorname{atan}{\left(\frac{\sqrt{2} \left(x + 1\right)}{2} \right)}$$
The graph
The answer
[src]
/ ___\ log(6) log(3) ___ |\/ 2 | ___ / ___\ ------ - ------ + \/ 2 *atan|-----| - \/ 2 *atan\\/ 2 / 2 2 \ 2 /
$$- \sqrt{2} \operatorname{atan}{\left(\sqrt{2} \right)} - \frac{\log{\left(3 \right)}}{2} + \sqrt{2} \operatorname{atan}{\left(\frac{\sqrt{2}}{2} \right)} + \frac{\log{\left(6 \right)}}{2}$$
=
=
/ ___\ log(6) log(3) ___ |\/ 2 | ___ / ___\ ------ - ------ + \/ 2 *atan|-----| - \/ 2 *atan\\/ 2 / 2 2 \ 2 /
$$- \sqrt{2} \operatorname{atan}{\left(\sqrt{2} \right)} - \frac{\log{\left(3 \right)}}{2} + \sqrt{2} \operatorname{atan}{\left(\frac{\sqrt{2}}{2} \right)} + \frac{\log{\left(6 \right)}}{2}$$
log(6)/2 - log(3)/2 + sqrt(2)*atan(sqrt(2)/2) - sqrt(2)*atan(sqrt(2))
The graph
Use the examples entering the upper and lower limits of integration.