Depending on what field of work you go into will depend on what your job will be like. Mechanical engineering is a broad career that deals with mechanical issues, and engineers typically work with mechanical physics, vibrations, forces, rotation, and velocity on a daily basis.
In today's world, computers have changed how mechanical engineers do their job, allowing complex analyses to be completed in a matter of seconds versus the days or weeks of hand calculations that were once the norm. However, mechanical engineers will still use industrial production equipment, material-handling systems, and electric generators to produce a fully refined product, and using calculus and trigonometry is needed when confronted with the more complex and analytical portions of the occupation.
