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Section: Mathematical Functions
Computes the asin function for its argument. The general syntax for its use is 
y = asin(x)
 where x is an n-dimensional array of numerical type. Integer types are promoted to the double type prior to calculation of the asin function. Output y is of the same size and type as the input x, (unless x is an integer, in which case y is a double type). 
Mathematically, the asin function is defined for all arguments x as 
![\[ \mathrm{asin} x \equiv - i \log \left(i x + \sqrt{1-x^2}\right). \]](form_50.png) 
 For real valued variables x in the range [-1,1], the function is computed directly using the standard C library's numerical asin function. For both real and complex arguments x, note that generally 
![\[ \mathrm{asin}(\sin(x)) \neq x, \]](form_51.png) 
 due to the periodicity of sin(x). 
The following code demonstates the asin function over the range [-1,1].
--> t = linspace(-1,1); --> plot(t,asin(t))
