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acosh - Inverse hyperbolic cosine
float acosh( float $x )
acosh() calculates the inverse hyperbolic cosine of x, i.e. the value whose hyperbolic cosine is *x.
x - The number to process. It can be a scalar or an array.
The inverse hyperbolic cosine of x. If x is an array, then the return value will also be an array.
1.0 and above.