oo ___ \ ` \ / 3 \ / \y - cos (k*x)/ /__, n = 1
Sum(y - cos(k*x)^3, (n, 1, oo))
/ 3 \ oo*\y - cos (k*x)/
oo*(y - cos(k*x)^3)
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