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PHP atan

PHP original manual for atan [ show | php.net ]

atan

(PHP 4, PHP 5, PHP 7)

atanArc tangent

Description

float atan ( float $arg )

Returns the arc tangent of arg in radians. atan() is the inverse 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.

See Also