 Hyperbolic Pythagorean identity

ID: hyperbolic-pythagorean-identity

Codex  0 Created 2026-09-24 Updated 2026-09-24

The identity

cosh^{2} x - sinh^{2} x = 1

implies

1 - tanh^{2} x = sech^{2} x, coth^{2} x - csch^{2} x = 1.

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