oo ____ \ ` \ / 2*n - 1 \ \ |x | / |--------*n - 1| / \ 2 / /___, n = 1
Sum((x^(2*n - 1)/2)*n - 1, (n, 1, oo))
/ 2 | x | 2| | --------- for |x | < 1 | 2 | / 2\ | \1 - x / | < oo | ___ | \ ` | \ 2*n | / n*x otherwise | /__, |n = 1 \ -oo + --------------------------- 2*x
-oo + Piecewise((x^2/(1 - x^2)^2, |x^2| < 1), (Sum(n*x^(2*n), (n, 1, oo)), True))/(2*x)
x^n/n
(x-1)^n
1/2^(n!)
n^2/n!
x^n/n!
k!/(n!*(n+k)!)
csc(n)^2/n^3
1/n^2
1/n^4
1/n^6
1/n
(-1)^n
(-1)^(n + 1)/n
(n + 2)*(-1)^(n - 1)
(3*n - 1)/(-5)^n
(-1)^(n - 1)*n/(6*n - 5)
(-1)^(n + 1)/n*x^n
(3*n - 1)/(-5)^n