## Marginalize Product of Functions

Hi everyone,

I've a question in sorta of an advanced channel coding. The subject in specific is Marginalize Product of Functions as the title says.

I've this function:

$3f({x}_{1},{x}_{2},{x}_{3})=\frac{1}{K}g({x}_{1})g({x}_{2})g({1-x}_{3})\delta{{x}_{2,}{x}_{1}}\delta{{x}_{2,}{1-x}_{3}}$