Ответ:
arccos(cos4п/) =arccos(-1/2)=2п/3
arccos(cos4п/3)=arccos(-1/2)=2п/3
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Ответ:
arccos(cos4п/) =arccos(-1/2)=2п/3
arccos(cos4п/3)=arccos(-1/2)=2п/3