osx man page for tan

TAN(3)							   BSD Library Functions Manual 						    TAN(3)

NAME
     tan -- tangent function

SYNOPSIS
     #include <math.h>

     double
     tan(double x);

     long double
     tanl(long double x);

     float
     tanf(float x);

DESCRIPTION
     The tan() function computes the tangent of x (measured in radians).

SPECIAL VALUES
     tan(+-0) returns +-0.

     tan(+-infinity) returns a NaN and raises the "invalid" floating-point exception.

VECTOR OPERATIONS
     If you need to apply the tan() 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 vtanf(vFloat x);
     void vvtanf(float *y, const float *x, const int *n);
     void vvtan(double *y, const double *x, const int *n);

SEE ALSO
     acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), sin(3), sinh(3), tanh(3), math(3)

STANDARDS
     The tan() function conforms to ISO/IEC 9899:2011.

BSD
								 December 11, 2006							       BSD