Haskell: Find maximum of three numbers

Sample.hs

import Prelude hiding(max)

max :: Int -> Int -> Int
max x y = if (x >= y) then x else y

getMaximum :: Int -> Int -> Int -> Int
getMaximum x y z = (x `max` y) `max` z

*Main> :load Sample.hs
[1 of 1] Compiling Main             ( Sample.hs, interpreted )
Ok, modules loaded: Main.
*Main> 
*Main> getMaximum 10 20 30
30
*Main> getMaximum 10 30 20
30
*Main> getMaximum 30 20 10
30
*Main> getMaximum 30 30 40
40
*Main> getMaximum 30 30 30
30

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