В треугольнике ABC{"color":"#202335","fontFamily":"stix","language":"ru"} AC=BC{"color":"#202335","fontFamily":"stix","language":"ru"}, AB=10{"color":"#202335","fontFamily":"stix","language":"ru"}, AH{"color":"#202335","fontFamily":"stix","language":"ru"} — высота, BH=2{"color":"#202335","fontFamily":"stix","language":"ru"}. Найдите косинус угла BAC{"color":"#202335","fontFamily":"stix","language":"ru"}.
