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# Exercises: Comprehension check
## Exercise 1
To declare these functions in the REPL, you need to prepend them with **let**.
`let half x = x / 2`
`let square x = x * x`
## Excercise 2
In the REPL:
`let foo x = 3.14 * (x * x)`
## Excercise 3
In the REPL:
`let bar x = pi * (x * x)`