oo ____ \ ` \ n \ x*x ) ----*n / n / 2 /___, n = 0
Sum(((x*x^n)/2^n)*n, (n, 0, oo))
// x |x| \ || ---------- for --- < 1| || 2 2 | || / x\ | || 2*|1 - -| | || \ 2/ | || | x*|< oo | || ___ | || \ ` | || \ -n n | || / n*2 *x otherwise | || /__, | ||n = 0 | \\ /
x*Piecewise((x/(2*(1 - x/2)^2), |x|/2 < 1), (Sum(n*2^(-n)*x^n, (n, 0, oo)), True))
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