В треугольнике ABC{"color":"#202335","fontFamily":"stix","language":"ru"} угол C {"color":"#202335","fontFamily":"stix","language":"ru"}равен 90°,{"color":"#202335","fontFamily":"stix","language":"ru"} BC=14,{"color":"#202335","fontFamily":"stix","language":"ru"} AB=20.{"color":"#202335","fontFamily":"stix","language":"ru"} Найдите cosB.{"color":"#202335","fontFamily":"stix","language":"ru"}
