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Section: Mathematical Functions
Computes the hyperbolic secant of the argument. The syntax for its use is
y = sech(x)
The sech function is computed from the formula 
![\[ \mathrm{sech}(x) = \frac{1}{\cosh(x)} \]](form_79.png) 
Here is a simple plot of the hyperbolic secant function
--> x = -2*pi:.01:2*pi;
--> plot(x,sech(x)); grid('on');
