[Haskell-cafe] Problem in code

[Jenny678]

hello,
I can not find the problem, I use WinHugs and shows me(Syntax error in input
(unexpected keyword "where"). 
here is my code:

f :: (Float,Float) -> Float
f (x,y) = (a(x,y) + 4) * (b(x,y) + 3)
where
a :: (Float,Float) -> Float
a(x,y) = (x + y)*2
b :: (Float,Float) -> Float
b(x,y) = (y - x)*5

How can I define this code with let in?
Thanks for any help.
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