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Annotation of researchv10dc/630/man/src/p_man/man3/itrig.3l, revision 1.1

1.1     ! root        1: .TH ITRIG 3L "630 MTG"
        !             2: .XE "cos()"
        !             3: .XE "sin()"
        !             4: .XE "atan2()"
        !             5: .SH NAME
        !             6: itrig: Icos, Isin, Iatan2 \- cosine, sine and arc tangent trigonometric functions
        !             7: .SH SYNOPSIS
        !             8: \f3
        !             9: int Icos (d) 
        !            10: .sp
        !            11: int Isin (d)
        !            12: .sp
        !            13: int Iatan2 (x, y)
        !            14: .sp
        !            15: .br
        !            16: int d;
        !            17: .br
        !            18: int x, y;
        !            19: .SH DESCRIPTION
        !            20: The
        !            21: .I Icos
        !            22: and
        !            23: .I Isin
        !            24: functions
        !            25: return scaled integer approximations to the trigonometric functions.
        !            26: The argument values are in degrees.
        !            27: The values returned are scaled so that
        !            28: .BR Icos(0)==1024 .
        !            29: .PP
        !            30: The
        !            31: .I Iatan2
        !            32: function
        !            33: returns the approximate arc-tangent of
        !            34: .I y/x.
        !            35: The return value is in integral degrees.
        !            36: The error in approximation may be as large as five degrees.
        !            37: .SH EXAMPLE
        !            38: These routines can be used to calculate mathematical expressions such as:
        !            39: .sp
        !            40: .ce
        !            41: .ft CM
        !            42: x=x0*Icos(d)
        !            43: .sp
        !            44: .ft R
        !            45: or to calculate a projection: 
        !            46: .sp
        !            47: .ce
        !            48: .ft CM
        !            49: x=muldiv(x0, Icos(d), 1024)
        !            50: .ft R
        !            51: .sp
        !            52: Note, the multiplication must be scaled.
        !            53: .SH SEE ALSO
        !            54: muldiv(3L).

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