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sinh - Hyperbolic sine
float sinh ( float $x )
sinh() returns the hyperbolic sine of x, defined as (exp(x) - exp(-x))/2.
(exp(x) - exp(-x))/2
x - The number to process. It can be a scalar or an array.
The hyperbolic sine of x. If x is an array, then the return value will also be an array.
1.0 and above.