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Inverse Hyperbolic Cosine Function
Syntax acosh(y)
See Also cosh , asinh , atanh , acoth

Description
Returns the element-by-element inverse cosh of y, where y is a real or double-precision matrix such that y(ij> 1 for all (ij).

Note that cosh(x) = cosh(-x), so there are two choices for its inverse. The return value of acosh is the positive inverse.

Example
     acosh(pi)
returns
     1.81153