PHP Manual
Math Functions
Hyperbolic cosine

cosh

(PHP 4 >= 4.1.0, PHP 5, PHP 7)

cosh — Hyperbolic cosine

Description

cosh ( float $arg ) : float

Returns the hyperbolic cosine of arg, defined as (exp(arg) + exp(-arg))/2.

Parameters

arg: The argument to process

Return Values

The hyperbolic cosine of arg

See Also

cos() - Cosine
acosh() - Inverse hyperbolic cosine
sinh() - Hyperbolic sine
tanh() - Hyperbolic tangent