php man page for cosh

COSH(3) 								 1								   COSH(3)

cosh - Hyperbolic cosine

SYNOPSIS
       float cosh (float  $arg)

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

PARAMETERS
	      o $arg
		- The argument to process

RETURN VALUES
	The hyperbolic cosine of $arg

SEE ALSO
       cos(3), acosh(3), sinh(3), cosh(3).

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