- Hyperbolic functions - Wikipedia
Just as the points (cos t, sin t) form a circle with a unit radius, the points (cosh t, sinh t) form the right half of the unit hyperbola Also, similarly to how the derivatives of sin (t) and cos (t) are cos (t) and –sin (t) respectively, the derivatives of sinh (t) and cosh (t) are cosh (t) and sinh (t) respectively
- Hyperbolic Functions - sinh, cosh, tanh, coth, sech, csch
\displaystyle \text {sinh}\ x - \text {sinh}\ y = 2 \text {cosh}\ \frac12 (x + y)\ \text {sinh} \frac12 (x - y) sinh x−sinh y = 2cosh 21 (x+y) sinh21 (x−y)
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