Sum of Squares of Sine and Cosine/Mistake

Source Work

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

cosine

Mistake

$\cosh^2 z + \sinh^2 z = 1$

Correction

This should read:

$\cos^2 z + \sin^2 z = 1$

Sources

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