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fplot: add hyperbolic functions

--- a/sys/src/cmd/fplot.c

+++ b/sys/src/cmd/fplot.c

@@ -57,6 +57,9 @@

 void osin(void) { *sp = sin(*sp); }

 void ocos(void) { *sp = cos(*sp); }

 void otan(void) { *sp = tan(*sp); }

+void osinh(void) { *sp = sinh(*sp); }

+void ocosh(void) { *sp = cosh(*sp); }

+void otanh(void) { *sp = tanh(*sp); }

 void oasin(void) { *sp = asin(*sp); }

 void oacos(void) { *sp = acos(*sp); }

 void oatan(void) { *sp = atan(*sp); }

@@ -80,6 +83,9 @@

 	"/",	OBINARY,	0,	200,	div,

 	"%",	OBINARY,	0,	200,	mod,

 	"^",	OBINARY,	1,	300,	pot,

+	"sinh",	OUNARY,		0,	400,	osinh,

+	"cosh",	OUNARY,		0,	400,	ocosh,

+	"tanh",	OUNARY,		0,	400,	otanh,

 	"abs",	OUNARY,		0,	400,	oabs,

 	"sin",	OUNARY,		0,	400,	osin,

 	"cos",	OUNARY,		0,	400,	ocos,

-- 

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