4.4BSD/usr/share/man/cat3/tan.0

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TAN(3)                      BSD Programmer's Manual                     TAN(3)

NNAAMMEE
     ttaann - tangent function

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<mmaatthh..hh>>

     _d_o_u_b_l_e
     ttaann(_d_o_u_b_l_e _x);

DDEESSCCRRIIPPTTIIOONN
     The ttaann() 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).

RREETTUURRNN VVAALLUUEESS
     The ttaann() function returns the tangent value.

SSEEEE AALLSSOO
     acos(3),  asin(3),  atan(3),  atan2(3),  cos(3),  cosh(3),  sin(3),
     sinh(3),  tanh(3),  math(3),

SSTTAANNDDAARRDDSS
     The ttaann() function conforms to ANSI C X3.159-1989 (``ANSI C '').

4.4BSD                           June 4, 1993                                1