Difference of Squares of Hyperbolic Cosine and Sine/Mistake

Source Work

1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics:

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.

Sources

• 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): hyperbolic function