how would i plug this into the calculator? to find the sum?(adsbygoogle = window.adsbygoogle || []).push({});

step by step process? thankss!

4

∑ 2 cos (π/k)

k = 1

i tried this site

http://mathbits.com/mathbits/tisection/Algebra2/summation.htm [Broken]

and i got a different answer...so i just need help with the set up on a T.I calc.

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# HELP! how to plug this into the calculator sigma notation?

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