" v) "cos306^(@)+cos234^(@)+cos162^(@)+c...

" v) "cos306^(@)+cos234^(@)+cos162^(@)+cos18^(@)=0

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Prove that cos306^(@) + cos234^(@) + cos162^(@) + cos18^(@) = 0

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cos130^(@)+cos110^(@)+cos10^(@)=0

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