Solving an equation for an Unknown Function Suppose that
Find a function f such that (Think about what operations you would have to perform on the formula for f to end up with the formula for h). Now suppose that
Use the same sort of reasoning to find a function g such that
of section 
youu were asked to solve equations in which the unknowns are functions. Now that we know about inverse and the identity function (see exercise 
), we can use algebra to solve 
for unknown function 
, we perform the following steps:
Problem: solve for 
Compose with 
on the right
Because 
Because 
for the indicated unknown function.
and 
, where 
and 
we saw that the inverse of
is 
and subtract 
” is “Add 
