TY JOUR TI DIFFERENTIAL CALCULUSAS A METHOD FOR SOLVING ENGINEERPROBLEMS KW mathematical model KW differential calculus KW curvature of curve KW the radius of the curvature KW extreme value JO Modern Technologies and Scientific and Technological Progress AU Sverdlova, O.L. AU Panov, L.A. AU Khramtsova, A.I. PY 2025 IS 2025 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»