cos(L+П/3)+cos(П/3-L)
cos(L+П/3)+cos(П/3-L)= cosLcosП/3 - sinLsinП/3 + cosП/3cosL + sinП/3sinL =
= 2 cosL 1/2 = cosL
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cos(L+П/3)+cos(П/3-L)= cosLcosП/3 - sinLsinП/3 + cosП/3cosL + sinП/3sinL =
= 2 cosL 1/2 = cosL