Help with telescoping summation problem

[jmile]

I have been staring at this for over an hour and cannot solve it. Please help.

∞
(cos(6/n)-cos(6/(n+2))
n = 1

You have to solve it via telescoping summation and yes it is convergent

 

[Deleted member 4993]

I have been staring at this for over an hour and cannot solve it. Please help.

∞
(cos(6/n)-cos(6/(n+2))
n = 1

You have to solve it via telescoping summation and yes it is convergent

Write out the first 6 terms of the summation (n = 1, 2, 3, 4, 5, 6 ......). Tell us if you see something brewing here!

Please show us what you have tried and exactly where you are stuck.

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