4 ____ \ ` \ n \ (-1) 2*n / ------*x / (2*n)! /___, n = 0
Sum(((-1)^n/factorial(2*n))*x^(2*n), (n, 0, 4))
2 6 4 8 x x x x 1 - -- - --- + -- + ----- 2 720 24 40320
1 - x^2/2 - x^6/720 + x^4/24 + x^8/40320
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