Calculation of Derivative.

Keyword Derivative,Hyperbolic cotangent curve.

Reference [1]：オーム社編：『機械工学公式集』,オーム社,pp.20,1960.

Remarks ・LaTeX： \frac{d}{dx}\textup{coth}\, x=-\textup{cosech}^{2}\, x\; , \textup{cosech}\, x=\frac{1}{\textup{sinh}\, x} ・Making above Equation Image is powered by CODECOGS

History ・2010/02/25：Upload.