Finding the value of trignometric series <msubsup> <mi mathvariant="normal">&#x03A3;<!-- Σ

Emanuel Keith

Emanuel Keith

Answered question

2022-06-21

Finding the value of trignometric series Σ 0 cos n x 3 n

Answer & Explanation

Bruno Hughes

Bruno Hughes

Beginner2022-06-22Added 24 answers

Hint. One may write, for x R ,
cos n x 3 n = Re ( e i x 3 ) n = Re z n
with z = e i x 3 then one may recall that
n = 0 z n = 1 1 z , | z | < 1.

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