Lor
2023 AMC 12B
Problem 22
A real-valued function 
has the property that for all real numbers 
and 
![\[f(a + b) + f(a - b) = 2f(a) f(b).\]](https://latex.artofproblemsolving.com/7/b/d/7bd7b5dc604674f392920ae5bd0a29c5ebbf73d7.png)
Which one of the following cannot be the value of 
Solution
Lor
2023 AMC 12B
Problem 22
A real-valued function has the property that for all real numbers and Which one of the following cannot be the value of
Solution