Haskell function composition

Question

I am reading this tutorial on Haskell. They define function composition as the following:

(.)                     :: (b->c) -> (a->b) -> (a-         


        

Answer 1

This example is contrived, but suppose we have

sqr x = x * x  
inc x = x + 1

and we want to write a function that computes x^2+1. We can write

xSquaredPlusOne = inc . sqr

(which means

xSquaredPlusOne x = (inc . sqr) x

which means

xSquaredPlusOne x = inc(sqr x)

since f=inc and g=sqr).