Question: In Haskell please!! data Expr = Lit Int | Add Expr Expr | Sub Expr Expr deriving Show Write a function depth that returns the

In Haskell please!!
data Expr = Lit Int
| Add Expr Expr
| Sub Expr Expr
deriving Show
Write a function depth that returns the depth of the integer expression tree. The root of the tree is depth level 0. depth :: Expr -> Int

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