Null sequences three part question
Determine whether each of the following sequences (An) converges or diverges. For each that converges, determine its limits
1) An=(n^2/n+1)(n^2/n+2), n=1,2..
2) An= (n^2 +1/3n^3  2n^2), n=1,2..
3) An = (n^3 cos (npie)/n^2 +1, n= 1,2...
Justify your answers carefully and write the solution out you may use null sequences in theorem D7 but you shoukd state clearly which result or rules you've used

For this question you need to provide Theorem D7.
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