Difference of Squares of Hyperbolic Cosine and Sine/Mistake

Source Work

 * hyperbolic function
 * hyperbolic function

Mistake

 * The hyperbolic functions satisfy the identity:
 * $\sinh^2 \alpha - \cosh^2 \alpha = 1$

Correction
This should read:


 * The hyperbolic functions satisfy the identity:
 * $\cosh^2 \alpha - \sinh^2 \alpha = 1$

This is demonstrated in Difference of Squares of Hyperbolic Cosine and Sine.