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Suma de la serie ((-1)^n)*x^(2n+1)/(2n+1)!



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Solución

Ha introducido [src]
  oo                 
____                 
\   `                
 \         n  2*n + 1
  \    (-1) *x       
  /    --------------
 /       (2*n + 1)!  
/___,                
n = 10               
$$\sum_{n=10}^{\infty} \frac{\left(-1\right)^{n} x^{2 n + 1}}{\left(2 n + 1\right)!}$$
Sum(((-1)^n*x^(2*n + 1))/factorial(2*n + 1), (n, 10, oo))
Respuesta [src]
    /                                            4                    8               12           16        18             14                  10                      6                        2                              \
 21 |-51090942171709440000 - 425757851430912000*x  - 140792940288000*x  - 8204716800*x   - 143640*x   + 420*x   + 39070080*x   + 1279935820800*x   + 10137091700736000*x  + 8515157028618240000*x    51090942171709440000*sin(x)|
x  *|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- + ---------------------------|
    |                                                                                              20                                                                                                             21            |
    \                                                                                             x                                                                                                              x              /
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                       51090942171709440000                                                                                                      
$$\frac{x^{21} \left(\frac{420 x^{18} - 143640 x^{16} + 39070080 x^{14} - 8204716800 x^{12} + 1279935820800 x^{10} - 140792940288000 x^{8} + 10137091700736000 x^{6} - 425757851430912000 x^{4} + 8515157028618240000 x^{2} - 51090942171709440000}{x^{20}} + \frac{51090942171709440000 \sin{\left(x \right)}}{x^{21}}\right)}{51090942171709440000}$$
x^21*((-51090942171709440000 - 425757851430912000*x^4 - 140792940288000*x^8 - 8204716800*x^12 - 143640*x^16 + 420*x^18 + 39070080*x^14 + 1279935820800*x^10 + 10137091700736000*x^6 + 8515157028618240000*x^2)/x^20 + 51090942171709440000*sin(x)/x^21)/51090942171709440000

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