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## Homework Statement

Determine whether the series converges absolutely, conditionally, or not at all.

a) [tex]\Sigma[/tex] (-1)

^{n}n

^{4}/(x

^{3}+ 1)

b) [tex]\Sigma[/tex] sin(x)/x

^{2}

## Homework Equations

## The Attempt at a Solution

a) positive series is n

^{4}/n

^{3}+1 .. do i do comparison test ??

b) |sin(x)|/x

^{2}

compare it with 1/x

^{2}which converges.. so it's absolutely convergent??