В треугольнике ABC{"color":"#202335","fontFamily":"stix","language":"ru"} угол C=90°,{"color":"#202335","fontFamily":"stix","language":"ru"}BC=5{"color":"#202335","fontFamily":"stix","language":"ru"}, AB=25{"color":"#202335","fontFamily":"stix","language":"ru"}. Найдите cosΒ{"color":"#202335","fontFamily":"stix","language":"ru"}.
