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Resolución de integrales/ sinax/ sinxsinax

Integral de sinxsinax dx

Límites de integración:

interior superior
v

Gráfico:

interior superior

Definida a trozos:

Solución

Ha introducido [src] 
  1                   
  /                   
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 |  sin(x)*sin(a*x) dx
 |                    
/                     
0
∫01sin⁡(x)sin⁡(ax) dx\int\limits_{0}^{1} \sin{\left(x \right)} \sin{\left(a x \right)}\, dx 
Integral(sin(x)*sin(a*x), (x, 0, 1))
Respuesta (Indefinida) [src] 
                            //                     2           2               \
                            ||cos(x)*sin(x)   x*cos (x)   x*sin (x)            |
                            ||------------- - --------- - ---------  for a = -1|
                            ||      2             2           2                |
                            ||                                                 |
  /                         ||     2           2                               |
 |                          ||x*cos (x)   x*sin (x)   cos(x)*sin(x)            |
 | sin(x)*sin(a*x) dx = C + |<--------- + --------- - -------------  for a = 1 |
 |                          ||    2           2             2                  |
/                           ||                                                 |
                            || cos(x)*sin(a*x)   a*cos(a*x)*sin(x)             |
                            || --------------- - -----------------   otherwise |
                            ||           2                  2                  |
                            ||     -1 + a             -1 + a                   |
                            \\                                                 /
∫sin⁡(x)sin⁡(ax) dx=C+{−xsin⁡2(x)2−xcos⁡2(x)2+sin⁡(x)cos⁡(x)2for a=−1xsin⁡2(x)2+xcos⁡2(x)2−sin⁡(x)cos⁡(x)2for a=1−asin⁡(x)cos⁡(ax)a2−1+sin⁡(ax)cos⁡(x)a2−1otherwise\int \sin{\left(x \right)} \sin{\left(a x \right)}\, dx = C + \begin{cases} - \frac{x \sin^{2}{\left(x \right)}}{2} - \frac{x \cos^{2}{\left(x \right)}}{2} + \frac{\sin{\left(x \right)} \cos{\left(x \right)}}{2} & \text{for}\: a = -1 \\\frac{x \sin^{2}{\left(x \right)}}{2} + \frac{x \cos^{2}{\left(x \right)}}{2} - \frac{\sin{\left(x \right)} \cos{\left(x \right)}}{2} & \text{for}\: a = 1 \\- \frac{a \sin{\left(x \right)} \cos{\left(a x \right)}}{a^{2} - 1} + \frac{\sin{\left(a x \right)} \cos{\left(x \right)}}{a^{2} - 1} & \text{otherwise} \end{cases}
Simplificar
Respuesta [src] 
/     2         2                               
|  cos (1)   sin (1)   cos(1)*sin(1)            
|- ------- - ------- + -------------  for a = -1
|     2         2            2                  
|                                               
|    2         2                                
| cos (1)   sin (1)   cos(1)*sin(1)             
< ------- + ------- - -------------   for a = 1 
|    2         2            2                   
|                                               
|  cos(1)*sin(a)   a*cos(a)*sin(1)              
|  ------------- - ---------------    otherwise 
|           2                2                  
|     -1 + a           -1 + a                   
\
{−sin⁡2(1)2−cos⁡2(1)2+sin⁡(1)cos⁡(1)2for a=−1−sin⁡(1)cos⁡(1)2+cos⁡2(1)2+sin⁡2(1)2for a=1−asin⁡(1)cos⁡(a)a2−1+sin⁡(a)cos⁡(1)a2−1otherwise\begin{cases} - \frac{\sin^{2}{\left(1 \right)}}{2} - \frac{\cos^{2}{\left(1 \right)}}{2} + \frac{\sin{\left(1 \right)} \cos{\left(1 \right)}}{2} & \text{for}\: a = -1 \\- \frac{\sin{\left(1 \right)} \cos{\left(1 \right)}}{2} + \frac{\cos^{2}{\left(1 \right)}}{2} + \frac{\sin^{2}{\left(1 \right)}}{2} & \text{for}\: a = 1 \\- \frac{a \sin{\left(1 \right)} \cos{\left(a \right)}}{a^{2} - 1} + \frac{\sin{\left(a \right)} \cos{\left(1 \right)}}{a^{2} - 1} & \text{otherwise} \end{cases} 
=
= 
/     2         2                               
|  cos (1)   sin (1)   cos(1)*sin(1)            
|- ------- - ------- + -------------  for a = -1
|     2         2            2                  
|                                               
|    2         2                                
| cos (1)   sin (1)   cos(1)*sin(1)             
< ------- + ------- - -------------   for a = 1 
|    2         2            2                   
|                                               
|  cos(1)*sin(a)   a*cos(a)*sin(1)              
|  ------------- - ---------------    otherwise 
|           2                2                  
|     -1 + a           -1 + a                   
\
{−sin⁡2(1)2−cos⁡2(1)2+sin⁡(1)cos⁡(1)2for a=−1−sin⁡(1)cos⁡(1)2+cos⁡2(1)2+sin⁡2(1)2for a=1−asin⁡(1)cos⁡(a)a2−1+sin⁡(a)cos⁡(1)a2−1otherwise\begin{cases} - \frac{\sin^{2}{\left(1 \right)}}{2} - \frac{\cos^{2}{\left(1 \right)}}{2} + \frac{\sin{\left(1 \right)} \cos{\left(1 \right)}}{2} & \text{for}\: a = -1 \\- \frac{\sin{\left(1 \right)} \cos{\left(1 \right)}}{2} + \frac{\cos^{2}{\left(1 \right)}}{2} + \frac{\sin^{2}{\left(1 \right)}}{2} & \text{for}\: a = 1 \\- \frac{a \sin{\left(1 \right)} \cos{\left(a \right)}}{a^{2} - 1} + \frac{\sin{\left(a \right)} \cos{\left(1 \right)}}{a^{2} - 1} & \text{otherwise} \end{cases} 
Piecewise((-cos(1)^2/2 - sin(1)^2/2 + cos(1)*sin(1)/2, a = -1), (cos(1)^2/2 + sin(1)^2/2 - cos(1)*sin(1)/2, a = 1), (cos(1)*sin(a)/(-1 + a^2) - a*cos(a)*sin(1)/(-1 + a^2), True))

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

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