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Section: Mathematical Functions
Computes the cot function for its argument. The general syntax for its use is 
y = cot(x)
 where x is an n-dimensional array of numerical type. Integer types are promoted to the double type prior to calculation of the cot 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 cot function is defined for all arguments x as 
![\[ \cot x \equiv \frac{\cos x}{\sin x} \]](form_64.png) 
 For complex valued arguments z, the cotangent is computed via 
![\[ \cot z \equiv \frac{\cos 2 \Re z + \cosh 2 \Im z}{\sin 2 \Re z + i \sinh 2 \Im z}. \]](form_65.png) 
The following piece of code plots the real-valued cot(x) function over the interval [-1,1]:
--> t = linspace(-1,1); --> plot(t,cot(t))
