S Chand Fundamentals of Engineering Mathematics Vol-II by HK Dass & Rama Verma

Engineering mathematics (also called Technomath) is a branch of applied mathematics concerning mathematical methods and techniques that are typically used in engineering and industry.

Along with fields like engineering physics and engineering geology, (both of which may belong in the wider category engineering science), engineering mathematics is an interdisciplinary subject motivated by engineers' needs both for practical, theoretical and other considerations outwith their specialization, and to deal with constraints to be effective in their work.