tan man page on 4.4BSD

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

NAME
     tan — tangent function

SYNOPSIS
     #include <math.h>

     double
     tan(double x);

DESCRIPTION
     The tan() function computes the tangent of x (measured in radians).  A
     large magnitude argument may yield a result with little or no signifi‐
     cance.  For a discussion of error due to roundoff, see math(3).

RETURN VALUES
     The tan() function returns the tangent value.

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 ANSI X3.159-1989 (“ANSI C89”).

BSD				 June 4, 1993				   BSD
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