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Integral de (sin(x)+cos(x))/(3+sin(x)) dx

Límites de integración:

interior superior
v

Gráfico:

interior superior

Definida a trozos:

Solución

Ha introducido [src]
  1                   
  /                   
 |                    
 |  sin(x) + cos(x)   
 |  --------------- dx
 |     3 + sin(x)     
 |                    
/                     
0                     
01sin(x)+cos(x)sin(x)+3dx\int\limits_{0}^{1} \frac{\sin{\left(x \right)} + \cos{\left(x \right)}}{\sin{\left(x \right)} + 3}\, dx
Integral((sin(x) + cos(x))/(3 + sin(x)), (x, 0, 1))
Solución detallada
  1. Vuelva a escribir el integrando:

    sin(x)+cos(x)sin(x)+3=sin(x)sin(x)+3+cos(x)sin(x)+3\frac{\sin{\left(x \right)} + \cos{\left(x \right)}}{\sin{\left(x \right)} + 3} = \frac{\sin{\left(x \right)}}{\sin{\left(x \right)} + 3} + \frac{\cos{\left(x \right)}}{\sin{\left(x \right)} + 3}

  2. Integramos término a término:

    1. No puedo encontrar los pasos en la búsqueda de esta integral.

      Pero la integral

      x32(atan(32tan(x2)4+24)+πx2π2π)2x - \frac{3 \sqrt{2} \left(\operatorname{atan}{\left(\frac{3 \sqrt{2} \tan{\left(\frac{x}{2} \right)}}{4} + \frac{\sqrt{2}}{4} \right)} + \pi \left\lfloor{\frac{\frac{x}{2} - \frac{\pi}{2}}{\pi}}\right\rfloor\right)}{2}

    1. que u=sin(x)+3u = \sin{\left(x \right)} + 3.

      Luego que du=cos(x)dxdu = \cos{\left(x \right)} dx y ponemos dudu:

      1udu\int \frac{1}{u}\, du

      1. Integral 1u\frac{1}{u} es log(u)\log{\left(u \right)}.

      Si ahora sustituir uu más en:

      log(sin(x)+3)\log{\left(\sin{\left(x \right)} + 3 \right)}

    El resultado es: x32(atan(32tan(x2)4+24)+πx2π2π)2+log(sin(x)+3)x - \frac{3 \sqrt{2} \left(\operatorname{atan}{\left(\frac{3 \sqrt{2} \tan{\left(\frac{x}{2} \right)}}{4} + \frac{\sqrt{2}}{4} \right)} + \pi \left\lfloor{\frac{\frac{x}{2} - \frac{\pi}{2}}{\pi}}\right\rfloor\right)}{2} + \log{\left(\sin{\left(x \right)} + 3 \right)}

  3. Ahora simplificar:

    x32(atan(2(3tan(x2)+1)4)+πx2π12)2+log(sin(x)+3)x - \frac{3 \sqrt{2} \left(\operatorname{atan}{\left(\frac{\sqrt{2} \left(3 \tan{\left(\frac{x}{2} \right)} + 1\right)}{4} \right)} + \pi \left\lfloor{\frac{x}{2 \pi} - \frac{1}{2}}\right\rfloor\right)}{2} + \log{\left(\sin{\left(x \right)} + 3 \right)}

  4. Añadimos la constante de integración:

    x32(atan(2(3tan(x2)+1)4)+πx2π12)2+log(sin(x)+3)+constantx - \frac{3 \sqrt{2} \left(\operatorname{atan}{\left(\frac{\sqrt{2} \left(3 \tan{\left(\frac{x}{2} \right)} + 1\right)}{4} \right)} + \pi \left\lfloor{\frac{x}{2 \pi} - \frac{1}{2}}\right\rfloor\right)}{2} + \log{\left(\sin{\left(x \right)} + 3 \right)}+ \mathrm{constant}


Respuesta:

x32(atan(2(3tan(x2)+1)4)+πx2π12)2+log(sin(x)+3)+constantx - \frac{3 \sqrt{2} \left(\operatorname{atan}{\left(\frac{\sqrt{2} \left(3 \tan{\left(\frac{x}{2} \right)} + 1\right)}{4} \right)} + \pi \left\lfloor{\frac{x}{2 \pi} - \frac{1}{2}}\right\rfloor\right)}{2} + \log{\left(\sin{\left(x \right)} + 3 \right)}+ \mathrm{constant}

Respuesta (Indefinida) [src]
                                        /        /x   pi\       /            ___    /x\\\                  
                                        |        |- - --|       |  ___   3*\/ 2 *tan|-|||                  
  /                                 ___ |        |2   2 |       |\/ 2               \2/||                  
 |                              3*\/ 2 *|pi*floor|------| + atan|----- + --------------||                  
 | sin(x) + cos(x)                      \        \  pi  /       \  4           4       //                  
 | --------------- dx = C + x - --------------------------------------------------------- + log(3 + sin(x))
 |    3 + sin(x)                                            2                                              
 |                                                                                                         
/                                                                                                          
sin(x)+cos(x)sin(x)+3dx=C+x32(atan(32tan(x2)4+24)+πx2π2π)2+log(sin(x)+3)\int \frac{\sin{\left(x \right)} + \cos{\left(x \right)}}{\sin{\left(x \right)} + 3}\, dx = C + x - \frac{3 \sqrt{2} \left(\operatorname{atan}{\left(\frac{3 \sqrt{2} \tan{\left(\frac{x}{2} \right)}}{4} + \frac{\sqrt{2}}{4} \right)} + \pi \left\lfloor{\frac{\frac{x}{2} - \frac{\pi}{2}}{\pi}}\right\rfloor\right)}{2} + \log{\left(\sin{\left(x \right)} + 3 \right)}
Gráfica
0.001.000.100.200.300.400.500.600.700.800.90010
Respuesta [src]
                                          /          /  ___       ___         \\           /          /  ___\\                                    
                                      ___ |          |\/ 2    3*\/ 2 *tan(1/2)||       ___ |          |\/ 2 ||                                    
                                  3*\/ 2 *|-pi + atan|----- + ----------------||   3*\/ 2 *|-pi + atan|-----||                                    
                /       2     \           \          \  4            4        //           \          \  4  //      /                      2     \
1 - log(9) - log\1 + tan (1/2)/ - ---------------------------------------------- + --------------------------- + log\9 + 6*tan(1/2) + 9*tan (1/2)/
                                                        2                                       2                                                 
32(π+atan(24))2log(9)log(tan2(12)+1)+1+log(9tan2(12)+6tan(12)+9)32(π+atan(24+32tan(12)4))2\frac{3 \sqrt{2} \left(- \pi + \operatorname{atan}{\left(\frac{\sqrt{2}}{4} \right)}\right)}{2} - \log{\left(9 \right)} - \log{\left(\tan^{2}{\left(\frac{1}{2} \right)} + 1 \right)} + 1 + \log{\left(9 \tan^{2}{\left(\frac{1}{2} \right)} + 6 \tan{\left(\frac{1}{2} \right)} + 9 \right)} - \frac{3 \sqrt{2} \left(- \pi + \operatorname{atan}{\left(\frac{\sqrt{2}}{4} + \frac{3 \sqrt{2} \tan{\left(\frac{1}{2} \right)}}{4} \right)}\right)}{2}
=
=
                                          /          /  ___       ___         \\           /          /  ___\\                                    
                                      ___ |          |\/ 2    3*\/ 2 *tan(1/2)||       ___ |          |\/ 2 ||                                    
                                  3*\/ 2 *|-pi + atan|----- + ----------------||   3*\/ 2 *|-pi + atan|-----||                                    
                /       2     \           \          \  4            4        //           \          \  4  //      /                      2     \
1 - log(9) - log\1 + tan (1/2)/ - ---------------------------------------------- + --------------------------- + log\9 + 6*tan(1/2) + 9*tan (1/2)/
                                                        2                                       2                                                 
32(π+atan(24))2log(9)log(tan2(12)+1)+1+log(9tan2(12)+6tan(12)+9)32(π+atan(24+32tan(12)4))2\frac{3 \sqrt{2} \left(- \pi + \operatorname{atan}{\left(\frac{\sqrt{2}}{4} \right)}\right)}{2} - \log{\left(9 \right)} - \log{\left(\tan^{2}{\left(\frac{1}{2} \right)} + 1 \right)} + 1 + \log{\left(9 \tan^{2}{\left(\frac{1}{2} \right)} + 6 \tan{\left(\frac{1}{2} \right)} + 9 \right)} - \frac{3 \sqrt{2} \left(- \pi + \operatorname{atan}{\left(\frac{\sqrt{2}}{4} + \frac{3 \sqrt{2} \tan{\left(\frac{1}{2} \right)}}{4} \right)}\right)}{2}
1 - log(9) - log(1 + tan(1/2)^2) - 3*sqrt(2)*(-pi + atan(sqrt(2)/4 + 3*sqrt(2)*tan(1/2)/4))/2 + 3*sqrt(2)*(-pi + atan(sqrt(2)/4))/2 + log(9 + 6*tan(1/2) + 9*tan(1/2)^2)
Respuesta numérica [src]
0.375568926353569
0.375568926353569

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