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Suma de la serie sin(2x)*sin(x)^n



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Solución

Ha introducido [src]
  oo                  
 ___                  
 \  `                 
  \               n   
  /   sin(2*x)*sin (x)
 /__,                 
n = 1                 
$$\sum_{n=1}^{\infty} \sin^{n}{\left(x \right)} \sin{\left(2 x \right)}$$
Sum(sin(2*x)*sin(x)^n, (n, 1, oo))
Respuesta [src]
//   sin(x)                      \         
|| ----------    for |sin(x)| < 1|         
|| 1 - sin(x)                    |         
||                               |         
||  oo                           |         
|< ___                           |*sin(2*x)
|| \  `                          |         
||  \      n                     |         
||  /   sin (x)     otherwise    |         
|| /__,                          |         
\\n = 1                          /         
$$\left(\begin{cases} \frac{\sin{\left(x \right)}}{1 - \sin{\left(x \right)}} & \text{for}\: \left|{\sin{\left(x \right)}}\right| < 1 \\\sum_{n=1}^{\infty} \sin^{n}{\left(x \right)} & \text{otherwise} \end{cases}\right) \sin{\left(2 x \right)}$$
Piecewise((sin(x)/(1 - sin(x)), Abs(sin(x)) < 1), (Sum(sin(x)^n, (n, 1, oo)), True))*sin(2*x)

    Ejemplos de hallazgo de la suma de la serie