В треугольнике ABC {"color":"#202335","fontFamily":"stix","language":"ru"}известно, что AB=6,{"color":"#202335","fontFamily":"stix","language":"ru"} BC=8,{"color":"#202335","fontFamily":"stix","language":"ru"} AC=4.{"color":"#202335","fontFamily":"stix","language":"ru"} Найдите cos∠ABC.{"color":"#202335","fontFamily":"stix","language":"ru"}
