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.rm #[ #] #H #V #F C
.IX Title "tan Cg"
.TH tan Cg "" "Cg Toolkit 2.2" "Cg Standard Library"
.UC
.SH "NAME"
\&\fBtan\fR \- returns tangent of scalars and vectors.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 5
\&  float  tan(float a);
\&  float1 tan(float1 a);
\&  float2 tan(float2 a);
\&  float3 tan(float3 a);
\&  float4 tan(float4 a);
.Ve
.Vb 5
\&  half   tan(half a);
\&  half1  tan(half1 a);
\&  half2  tan(half2 a);
\&  half3  tan(half3 a);
\&  half4  tan(half4 a);
.Ve
.Vb 5
\&  fixed  tan(fixed a);
\&  fixed1 tan(fixed1 a);
\&  fixed2 tan(fixed2 a);
\&  fixed3 tan(fixed3 a);
\&  fixed4 tan(fixed4 a);
.Ve
.SH "PARAMETERS"
.IX Header "PARAMETERS"
.Ip "a" 8
.IX Item "a"
Vector or scalar of which to determine the tangent.
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Returns the tangent of \fIa\fR in radians.
.PP
For vectors, the returned vector contains the tangent of each
element of the input vector.
.SH "REFERENCE IMPLEMENTATION"
.IX Header "REFERENCE IMPLEMENTATION"
\&\fBtan\fR can be implemented in terms of the \fBsin\fR and \fBcos\fR functions like this:
.PP
.Vb 5
\&  float tan(float a) {
\&    float s, c;
\&    sincos(a, s, c);
\&    return s / c;
\&  }
.Ve
.SH "PROFILE SUPPORT"
.IX Header "PROFILE SUPPORT"
\&\fBtan\fR is fully supported in all profiles unless otherwise specified.
.PP
\&\fBtan\fR is supported via approximations of \fBsin\fR and \fBcos\fR functions
(see the respective sin and cos manual pages for details)
in the vs_1, vp20, and arbvp1 profiles.
.PP
\&\fBtan\fR is unsupported in the fp20, ps_1_1, ps_1_2, and ps_1_3 profiles.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
atan, atan2, cos, dot, frac, sin, sincos
