cal­cu­la­tor – Use LaTeX as a sci­en­tific cal­cu­la­tor

The cal­cu­la­tor and cal­cu­lus pack­ages de­fine sev­eral in­struc­tions which al­low us to re­alise al­ge­braic op­er­a­tions and to eval­u­ate el­e­men­tary func­tions and deriva­tives in our doc­u­ments.
The pack­age’s main goal is to de­fine the arith­metic and func­tional cal­cu­la­tions need in the au­thor’s pack­age xpic­ture, but the nu­meric abil­i­ties of “cal­cu­la­tor” and “cal­cu­lus” may be use­ful in other con­texts.