Ответ:
cos2=-0,41
cos4=-0,65
-0,41+0,65/-0,41-0,65=0,24/-1,06=~-0,2
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Ответ:
cos2=-0,41
cos4=-0,65
-0,41+0,65/-0,41-0,65=0,24/-1,06=~-0,2