Determine whether the series converges absolutely, conditionally, or not at all.
a) [tex]\Sigma[/tex] (-1)nn4/(x3 + 1)
b) [tex]\Sigma[/tex] sin(x)/x2
The Attempt at a Solution
a) positive series is n4/n3+1 .. do i do comparison test ??
compare it with 1/x2 which converges.. so it's absolutely convergent??