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

N\bNA\bAM\bME\bE
    a\bat\bta\ban\bn - arc tangent function of one variable

S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
    #\b#i\bin\bnc\bcl\blu\bud\bde\be <\b<m\bma\bat\bth\bh.\b.h\bh>\b>

    _\bd_\bo_\bu_\bb_\bl_\be
    a\bat\bta\ban\bn(_\bd_\bo_\bu_\bb_\bl_\be _\bx);

D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
    The a\bat\bta\ban\bn() function computes the principal value of the arc tangent of _\bx.
    For a discussion of error due to roundoff, see math(3).

R\bRE\bET\bTU\bUR\bRN\bN V\bVA\bAL\bLU\bUE\bES\bS
    The a\bat\bta\ban\bn() function returns the arc tangent in the range [-pi/2, +pi/2]
    radians.

S\bSE\bEE\bE A\bAL\bLS\bSO\bO
    acos(3),  asin(3),  atan2(3),  cos(3),  cosh(3),  sin(3),  sinh(3),
    tan(3),  tanh(3),  math(3),

S\bST\bTA\bAN\bND\bDA\bAR\bRD\bDS\bS
    The a\bat\bta\ban\bn() function conforms to ANSI C X3.159-1989 (``ANSI C '').

4.4BSD                           June 4, 1993                                1