Composition of Functions (f o g)(x) The term "composition of functions" (or "composite function") refers to the combining of functions in a manner where the output from one function becomes the input for the next function. In math terms, the range (the y-value answers) of one function becomes the domain (the x-values) of the next function.The notation used for … [Read more...] about Composition of Functions (f o g)(x)