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carg.3: Add introductory sentence explaining what these functions calculate 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2015-04-12 12:18:38 +02:00
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@ -18,6 +18,10 @@ carg, cargf, cargl \- calculate the complex argument
.sp
Link with \fI\-lm\fP.
.SH DESCRIPTION
These functions calculate the complex argument (also called phase angle) of
.IR z ,
with a branch cut along the negative real axis.
A complex number can be described by two real coordinates.
One may use rectangular coordinates and gets