recip package:dimensional

recip :: Fractional a => Quantity d a -> Quantity (Recip d) a
dimensional Numeric.Units.Dimensional Numeric.Units.Dimensional.Prelude
Forms the reciprocal of a Quantity, which has the reciprocal dimension. 
>>> recip $ 47 *~ hertz
2.127659574468085e-2 s
recip :: Dimension' -> Dimension'
dimensional Numeric.Units.Dimensional.Dimensions.TermLevel
Forms the reciprocal of a dimension.
recip :: AnyUnit -> AnyUnit
dimensional Numeric.Units.Dimensional.Dynamic
Forms the reciprocal of a dynamic unit.
type Recip (d :: Dimension) = DOne / d
dimensional Numeric.Units.Dimensional Numeric.Units.Dimensional.Dimensions.TypeLevel Numeric.Units.Dimensional.FixedPoint Numeric.Units.Dimensional.Prelude
The reciprocal of a dimension is defined as the result of dividing DOne by it, or of negating each of the base dimensions' exponents.