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PHP Manual [atan]

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PHP Manual || Math Functions

(PHP 4, PHP 5, PHP 7)

atanArc tangent

Description

atan ( float $arg ) : float

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



PHP Manual || Math Functions