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Suma de la serie sin^n(x)/3^n



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Solución

Ha introducido [src]
  oo         
____         
\   `        
 \       n   
  \   sin (x)
   )  -------
  /       n  
 /       3   
/___,        
n = 1        
$$\sum_{n=1}^{\infty} \frac{\sin^{n}{\left(x \right)}}{3^{n}}$$
Sum(sin(x)^n/3^n, (n, 1, oo))
Respuesta [src]
/     sin(x)            |sin(x)|    
| --------------    for -------- < 1
|   /    sin(x)\           3        
| 3*|1 - ------|                    
|   \      3   /                    
|                                   
<  oo                               
| ___                               
| \  `                              
|  \    -n    n                     
|  /   3  *sin (x)     otherwise    
| /__,                              
\n = 1                              
$$\begin{cases} \frac{\sin{\left(x \right)}}{3 \left(1 - \frac{\sin{\left(x \right)}}{3}\right)} & \text{for}\: \frac{\left|{\sin{\left(x \right)}}\right|}{3} < 1 \\\sum_{n=1}^{\infty} 3^{- n} \sin^{n}{\left(x \right)} & \text{otherwise} \end{cases}$$
Piecewise((sin(x)/(3*(1 - sin(x)/3)), Abs(sin(x))/3 < 1), (Sum(3^(-n)*sin(x)^n, (n, 1, oo)), True))

    Ejemplos de hallazgo de la suma de la serie