From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001
From: Vladimir Azarov <avm@intermediate-node.net>
Date: Tue, 1 Oct 2024 15:47:05 +0200
Subject: Initial version

---
 src/complex/cacosh.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 src/complex/cacosh.c

(limited to 'src/complex/cacosh.c')

diff --git a/src/complex/cacosh.c b/src/complex/cacosh.c
new file mode 100644
index 0000000..76127f7
--- /dev/null
+++ b/src/complex/cacosh.c
@@ -0,0 +1,12 @@
+#include "complex_impl.h"
+
+/* acosh(z) = i acos(z) */
+
+double complex cacosh(double complex z)
+{
+	int zineg = signbit(cimag(z));
+
+	z = cacos(z);
+	if (zineg) return CMPLX(cimag(z), -creal(z));
+	else       return CMPLX(-cimag(z), creal(z));
+}
-- 
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