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atan2	atanh

	Last updated: Thu, 26 Jun 2008

atan

(PHP 4, PHP 5)

atan — Arc tangent

Description

float atan ( float $arg )

Returns the arc tangent of arg in radians. atan() is the complementary function of tan(), which means that a==tan(atan(a)) for every value of a that is within atan()'s range.

Parameters

arg: The argument to process

Return Values

The arc tangent of arg in radians.

atan

Description

Parameters

Return Values

See Also