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Section: Mathematical Functions
Computes the inverse hyperbolic cosecant of its argument. The general syntax for its use is
y = acsch(x)
 where x is an n-dimensional array of numerical type. 
The acsch function is computed from the formula 
![\[ \mathrm{csch}^{-1}(x) = \sinh^{-1}\left(\frac{1}{x}\right) \]](form_45.png) 
Here is a simple plot of the inverse hyperbolic cosecant function
--> x1 = -20:.01:-1;
--> x2 = 1:.01:20;
--> plot(x1,acsch(x1),x2,acsch(x2)); grid('on');
