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How does cos(x) + cos(x + 2À/3) + cos(x + 4À/3) = 0?This exercise requires us to use "sum to product" formulae.I only know of the formula where there are 2 "parts" eg: cos(x) + cos(y) =...I'm not sure how to utilize this formulae for the above question.Any help would be appreciated. Thanks a lot.
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