# Calculating Partial Differential Equations

I need help computing the following integral where m and n are non-negative integers.

a). cos (n*pi*x/L) cos(m*pi*x/L) dx

b). cos (n*pi*x/L) sin(m*pi*x/L) dx

https://brainmass.com/math/partial-differential-equations/calculating-partial-differential-equations-130545

#### Solution Summary

The solution is comprised of an example of solving partial differential equations in an attached Word document.

$2.19