(cosh [x])Returns the hyperbolic cosine of x, (e^x + e^-x)/2.
If x is ##NaN => ##NaN
If x is ##Inf or ##-Inf => ##Inf
If x is zero => 1.0
See: https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#cosh-double-
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