oo ____ \ ` \ 1 \ ------------------- ) ________________ / / 4 2 / \/ k + 7*k + 20 /___, n = 2
Sum(1/(sqrt(k^4 + 7*k^2 + 20)), (n, 2, oo))
oo ------------------- ________________ / 4 2 \/ 20 + k + 7*k
oo/sqrt(20 + k^4 + 7*k^2)
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