prove this....thanks in advance
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see cos306= cos(360-54)= cos54
cos234=cos(180+54)= -cos54
cos(162)=cos(180-18)= -cos18
cos18= cos18
NOW cos54-cos54-cos18+cos18=0
proved
cos234=cos(180+54)= -cos54
cos(162)=cos(180-18)= -cos18
cos18= cos18
NOW cos54-cos54-cos18+cos18=0
proved
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