Question

Sum from n=1 to infinity of 2sin(2/n)

Sum from n=1 to infinity of (2+4n)/(1+n^2)^3

Sum from n=1 to infinity of ((n^2)-3n)/((n^3)+2n+2)

Answer 1

2sin(2) for the 1st one
0.75 or 3/4 for the 2nd one
-0.4 or -2over5 for the 3rd one.

Best i can do, good luck.

Answer 2

Can you explain how you got these answers? @kobe9115

Answer 3

I changed the N's to the given and solved them from there.

Answer 4

Look like you don't know how sum (series) works.

You don't just plug in value of n.