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Integral de x/(x^3+3) dx

Límites de integración:

interior superior
v

Gráfico:

interior superior

Definida a trozos:

Solución

Ha introducido [src]
 oo          
  /          
 |           
 |    x      
 |  ------ dx
 |   3       
 |  x  + 3   
 |           
/            
2            
$$\int\limits_{2}^{\infty} \frac{x}{x^{3} + 3}\, dx$$
Integral(x/(x^3 + 3), (x, 2, oo))
Respuesta (Indefinida) [src]
                                                   /    ___       6 ___\                                
  /                                      6 ___     |  \/ 3    2*x*\/ 3 |                                
 |                  2/3    /    3 ___\   \/ 3 *atan|- ----- + ---------|    2/3    / 2/3    2     3 ___\
 |   x             3   *log\x + \/ 3 /             \    3         3    /   3   *log\3    + x  - x*\/ 3 /
 | ------ dx = C - ------------------- + ------------------------------- + -----------------------------
 |  3                       9                           3                                18             
 | x  + 3                                                                                               
 |                                                                                                      
/                                                                                                       
$$\int \frac{x}{x^{3} + 3}\, dx = C - \frac{3^{\frac{2}{3}} \log{\left(x + \sqrt[3]{3} \right)}}{9} + \frac{3^{\frac{2}{3}} \log{\left(x^{2} - \sqrt[3]{3} x + 3^{\frac{2}{3}} \right)}}{18} + \frac{\sqrt[6]{3} \operatorname{atan}{\left(\frac{2 \sqrt[6]{3} x}{3} - \frac{\sqrt{3}}{3} \right)}}{3}$$
Gráfica
Respuesta [src]
/                                                /           pi*I\                   /           5*pi*I\\           
|                                      -pi*I     |           ----|           pi*I    |           ------||           
|          /    3 ___  pi*I\           ------    |    3 ___   3  |           ----    |    3 ___    3   ||           
|   2/3    |    \/ 3 *e    |      2/3    3       |    \/ 3 *e    |      2/3   3      |    \/ 3 *e      ||           
|2*3   *log|1 - -----------|   2*3   *e      *log|1 - -----------|   2*3   *e    *log|1 - -------------||           
|          \         2     /                     \         2     /                   \          2      /|           
|--------------------------- - ----------------------------------- - -----------------------------------|*Gamma(1/3)
\             9                                 9                                     9                 /           
--------------------------------------------------------------------------------------------------------------------
                                                    6*Gamma(4/3)                                                    
$$\frac{\left(- \frac{2 \cdot 3^{\frac{2}{3}} e^{\frac{i \pi}{3}} \log{\left(- \frac{\sqrt[3]{3} e^{\frac{5 i \pi}{3}}}{2} + 1 \right)}}{9} + \frac{2 \cdot 3^{\frac{2}{3}} \log{\left(- \frac{\sqrt[3]{3} e^{i \pi}}{2} + 1 \right)}}{9} - \frac{2 \cdot 3^{\frac{2}{3}} e^{- \frac{i \pi}{3}} \log{\left(1 - \frac{\sqrt[3]{3} e^{\frac{i \pi}{3}}}{2} \right)}}{9}\right) \Gamma\left(\frac{1}{3}\right)}{6 \Gamma\left(\frac{4}{3}\right)}$$
=
=
/                                                /           pi*I\                   /           5*pi*I\\           
|                                      -pi*I     |           ----|           pi*I    |           ------||           
|          /    3 ___  pi*I\           ------    |    3 ___   3  |           ----    |    3 ___    3   ||           
|   2/3    |    \/ 3 *e    |      2/3    3       |    \/ 3 *e    |      2/3   3      |    \/ 3 *e      ||           
|2*3   *log|1 - -----------|   2*3   *e      *log|1 - -----------|   2*3   *e    *log|1 - -------------||           
|          \         2     /                     \         2     /                   \          2      /|           
|--------------------------- - ----------------------------------- - -----------------------------------|*Gamma(1/3)
\             9                                 9                                     9                 /           
--------------------------------------------------------------------------------------------------------------------
                                                    6*Gamma(4/3)                                                    
$$\frac{\left(- \frac{2 \cdot 3^{\frac{2}{3}} e^{\frac{i \pi}{3}} \log{\left(- \frac{\sqrt[3]{3} e^{\frac{5 i \pi}{3}}}{2} + 1 \right)}}{9} + \frac{2 \cdot 3^{\frac{2}{3}} \log{\left(- \frac{\sqrt[3]{3} e^{i \pi}}{2} + 1 \right)}}{9} - \frac{2 \cdot 3^{\frac{2}{3}} e^{- \frac{i \pi}{3}} \log{\left(1 - \frac{\sqrt[3]{3} e^{\frac{i \pi}{3}}}{2} \right)}}{9}\right) \Gamma\left(\frac{1}{3}\right)}{6 \Gamma\left(\frac{4}{3}\right)}$$
(2*3^(2/3)*log(1 - 3^(1/3)*exp_polar(pi*i)/2)/9 - 2*3^(2/3)*exp(-pi*i/3)*log(1 - 3^(1/3)*exp_polar(pi*i/3)/2)/9 - 2*3^(2/3)*exp(pi*i/3)*log(1 - 3^(1/3)*exp_polar(5*pi*i/3)/2)/9)*gamma(1/3)/(6*gamma(4/3))

    Estos ejemplos se pueden aplicar para introducción de los límites de integración inferior y superior.