Double Angle Formulas/Hyperbolic Sine/Corollary

Corollary to Double Angle Formula for Hyperbolic Sine

 * $\map \sinh {2 \theta} = \dfrac {2 \tanh \theta} {1 - \tanh^2 \theta}$

where $\sinh$ and $\tanh$ denote hyperbolic sine and hyperbolic tangent respectively.