[Haskell-beginners] How to use trigonometric functions with Data.Scientific?

Hi, I am writing a program to do some astronomical calculation, and I am using the Data.Scientific library to represent my floating point numbers. Would anyone know how to use trigonometric functions with the Scientific type? I see: a :: Scientific a = scientific 500036 (-5) sin :: Floating a => a -> a -- this won't work wrongType = sin a Any ideas? Many Thanks Martin