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csinh.3: Add introductory sentence explaining what these functions calculate
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -18,6 +18,9 @@ csinh, csinhf, csinhl \- complex hyperbolic sine
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.sp
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Link with \fI\-lm\fP.
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.SH DESCRIPTION
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These functions calculate the complex hyperbolic sine of
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.IR z .
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The complex hyperbolic sine function is defined as:
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.nf
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