Peter Math on Instagram: "The u-substitution method is a technique in calculus used to make difficult integrals easier to solve by changing variables. It involves identifying a part of the integrand, usually a function within another function, and substituting it with a new variable, commonly called u. This substitution simplifies the integral by transforming it into a more straightforward form. Once the substitution is made, the differential of the new variable is used to replace the correspond