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Integral de ln(x+1)^1/2-1 dx

Límites de integración:

interior superior
v

Gráfico:

interior superior

Definida a trozos:

Solución

Ha introducido [src]
  1                        
  /                        
 |                         
 |  /  ____________    \   
 |  \\/ log(x + 1)  - 1/ dx
 |                         
/                          
0                          
01(log(x+1)1)dx\int\limits_{0}^{1} \left(\sqrt{\log{\left(x + 1 \right)}} - 1\right)\, dx
Integral(sqrt(log(x + 1)) - 1, (x, 0, 1))
Solución detallada
  1. Integramos término a término:

    1. que u=log(x+1)u = \log{\left(x + 1 \right)}.

      Luego que du=dxx+1du = \frac{dx}{x + 1} y ponemos dudu:

      ueudu\int \sqrt{u} e^{u}\, du

        UpperGammaRule(a=1, e=1/2, context=sqrt(_u)*exp(_u), symbol=_u)

      Si ahora sustituir uu más en:

      (log(x+1)(x+1)+πerfc(log(x+1))2)log(x+1)log(x+1)\frac{\left(\sqrt{- \log{\left(x + 1 \right)}} \left(x + 1\right) + \frac{\sqrt{\pi} \operatorname{erfc}{\left(\sqrt{- \log{\left(x + 1 \right)}} \right)}}{2}\right) \sqrt{\log{\left(x + 1 \right)}}}{\sqrt{- \log{\left(x + 1 \right)}}}

    1. La integral de las constantes tienen esta constante multiplicada por la variable de integración:

      (1)dx=x\int \left(-1\right)\, dx = - x

    El resultado es: x+(log(x+1)(x+1)+πerfc(log(x+1))2)log(x+1)log(x+1)- x + \frac{\left(\sqrt{- \log{\left(x + 1 \right)}} \left(x + 1\right) + \frac{\sqrt{\pi} \operatorname{erfc}{\left(\sqrt{- \log{\left(x + 1 \right)}} \right)}}{2}\right) \sqrt{\log{\left(x + 1 \right)}}}{\sqrt{- \log{\left(x + 1 \right)}}}

  2. Ahora simplificar:

    xlog(x+1)x+log(x+1)+πlog(x+1)erfc(log(x+1))2log(x+1)x \sqrt{\log{\left(x + 1 \right)}} - x + \sqrt{\log{\left(x + 1 \right)}} + \frac{\sqrt{\pi} \sqrt{\log{\left(x + 1 \right)}} \operatorname{erfc}{\left(\sqrt{- \log{\left(x + 1 \right)}} \right)}}{2 \sqrt{- \log{\left(x + 1 \right)}}}

  3. Añadimos la constante de integración:

    xlog(x+1)x+log(x+1)+πlog(x+1)erfc(log(x+1))2log(x+1)+constantx \sqrt{\log{\left(x + 1 \right)}} - x + \sqrt{\log{\left(x + 1 \right)}} + \frac{\sqrt{\pi} \sqrt{\log{\left(x + 1 \right)}} \operatorname{erfc}{\left(\sqrt{- \log{\left(x + 1 \right)}} \right)}}{2 \sqrt{- \log{\left(x + 1 \right)}}}+ \mathrm{constant}


Respuesta:

xlog(x+1)x+log(x+1)+πlog(x+1)erfc(log(x+1))2log(x+1)+constantx \sqrt{\log{\left(x + 1 \right)}} - x + \sqrt{\log{\left(x + 1 \right)}} + \frac{\sqrt{\pi} \sqrt{\log{\left(x + 1 \right)}} \operatorname{erfc}{\left(\sqrt{- \log{\left(x + 1 \right)}} \right)}}{2 \sqrt{- \log{\left(x + 1 \right)}}}+ \mathrm{constant}

Respuesta (Indefinida) [src]
                                                    /                            ____     /  _____________\\
  /                                    ____________ |  _____________           \/ pi *erfc\\/ -log(x + 1) /|
 |                                   \/ log(x + 1) *|\/ -log(x + 1) *(x + 1) + ----------------------------|
 | /  ____________    \                             \                                       2              /
 | \\/ log(x + 1)  - 1/ dx = C - x + -----------------------------------------------------------------------
 |                                                                 _____________                            
/                                                                \/ -log(x + 1)                             
(log(x+1)1)dx=Cx+(log(x+1)(x+1)+πerfc(log(x+1))2)log(x+1)log(x+1)\int \left(\sqrt{\log{\left(x + 1 \right)}} - 1\right)\, dx = C - x + \frac{\left(\sqrt{- \log{\left(x + 1 \right)}} \left(x + 1\right) + \frac{\sqrt{\pi} \operatorname{erfc}{\left(\sqrt{- \log{\left(x + 1 \right)}} \right)}}{2}\right) \sqrt{\log{\left(x + 1 \right)}}}{\sqrt{- \log{\left(x + 1 \right)}}}
Gráfica
0.001.000.100.200.300.400.500.600.700.800.90-2.00.0
Respuesta [src]
         ____     /  ____     /    ________\                 \
     I*\/ pi      |\/ pi *erfc\I*\/ log(2) /         ________|
-1 + -------- - I*|------------------------- + 2*I*\/ log(2) |
        2         \            2                             /
1i(πerfc(ilog(2))2+2ilog(2))+iπ2-1 - i \left(\frac{\sqrt{\pi} \operatorname{erfc}{\left(i \sqrt{\log{\left(2 \right)}} \right)}}{2} + 2 i \sqrt{\log{\left(2 \right)}}\right) + \frac{i \sqrt{\pi}}{2}
=
=
         ____     /  ____     /    ________\                 \
     I*\/ pi      |\/ pi *erfc\I*\/ log(2) /         ________|
-1 + -------- - I*|------------------------- + 2*I*\/ log(2) |
        2         \            2                             /
1i(πerfc(ilog(2))2+2ilog(2))+iπ2-1 - i \left(\frac{\sqrt{\pi} \operatorname{erfc}{\left(i \sqrt{\log{\left(2 \right)}} \right)}}{2} + 2 i \sqrt{\log{\left(2 \right)}}\right) + \frac{i \sqrt{\pi}}{2}
-1 + i*sqrt(pi)/2 - i*(sqrt(pi)*erfc(i*sqrt(log(2)))/2 + 2*i*sqrt(log(2)))
Respuesta numérica [src]
-0.40740957750243
-0.40740957750243

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