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