Final answer:
In calculus, a change of variables is used to simplify integrals by substituting the original variables with new variables. This allows for easier evaluation of the integral.
Step-by-step explanation:
In calculus, when solving integrals that involve certain expressions, it is often beneficial to use a change of variables in order to simplify the integral. This change of variables involves substituting the original variables with new variables that make the integral easier to evaluate. The suggested change of variables depends on the specific integral being considered and may involve manipulating the given expression to express it in terms of the new variables.