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Section: Mathematical Functions
Computes the inverse secant of its argument. The general syntax for its use is
y = asec(x)
 where x is an n-dimensional array of numerical type. 
The acosh function is computed from the formula 
![\[ \sec^{-1}(x) = \cos^{-1}\left(\frac{1}{x}\right) \]](form_48.png) 
Here is a simple plot of the inverse secant function
--> x1 = -5:.01:-1;
--> x2 = 1:.01:5;
--> plot(x1,asec(x1),x2,asec(x2)); grid('on');
