oo ___ \ ` \ / n \ / \x + 12/ /__, n = 1
Sum(x^n + 12, (n, 1, oo))
// x \ || ----- for |x| < 1| || 1 - x | || | || oo | oo + |< ___ | || \ ` | || \ n | || / x otherwise | || /__, | \\n = 1 /
oo + Piecewise((x/(1 - x), |x| < 1), (Sum(x^n, (n, 1, 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