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import math math.atan(arg) 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
Return ValuesThe arc tangent of arg in radians. |
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