[ C ] uk/ˈtændʒənt/ us a straight line that touches but does not cross a curve
касательная in a triangle that has one angle of 90°, the ratio of the length of the side opposite an angle less than 90° divided by the length of the shorter of the two sides that are next to the angle
тангенс (математический) Сравнитеcosinesine Идиомыgo off at/on a tangent