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atan(3) [php man page]

ATAN(3) 								 1								   ATAN(3)

atan - Arc tangent

SYNOPSIS
float atan (float $arg) DESCRIPTION
Returns the arc tangent of $arg in radians. atan(3) is the complementary function of tan(3), which means that a==tan(atan(a)) for every value of a that is within atan(3)'s range. PARAMETERS
o $arg - The argument to process RETURN VALUES
The arc tangent of $arg in radians. SEE ALSO
tan(3), atanh(3), asin(3), acos(3). PHP Documentation Group ATAN(3)
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