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atan(3) [php man page]

ATAN(3) 								 1								   ATAN(3)

atan - Arc tangent

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)

Check Out this Related Man Page

ATAN(3) 						   BSD Library Functions Manual 						   ATAN(3)

atan -- arc tangent function of one variable SYNOPSIS
#include <math.h> double atan(double x); long double atanl(long double x); float atanf(float x); DESCRIPTION
The atan() function computes the principal value of the arc tangent of x. The result is in the range [-pi/2, +pi/2]. SPECIAL VALUES
atan(+-0) returns +-0. atan(+-infinity) returns +-pi/2 VECTOR OPERATIONS
If you need to apply the atan() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may give significantly better performance: #include <Accelerate/Accelerate.h> vFloat vatanf(vFloat x); void vvatanf(float *y, const float *x, const int *n); void vvatan(double *y, const double *x, const int *n); SEE ALSO
acos(3), asin(3), atan2(3), cos(3), cosh(3), sin(3), sinh(3), tan(3), tanh(3), math(3) The atan() function conforms to ISO/IEC 9899:2011. BSD
December 11, 2006 BSD

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