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ctanh.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 12:55:18 +02:00
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@ -18,6 +18,9 @@ ctanh, ctanhf, ctanhl \- complex hyperbolic tangent
.sp
Link with \fI\-lm\fP.
.SH DESCRIPTION
These functions calculate the complex hyperbolic tangent of
.IR z .
The complex hyperbolic tangent function is defined
mathematically as:
.nf