1 files changed, 6 insertions, 0 deletions
diff --git a/lib/libm/catanh.c b/lib/libm/catanh.c
new file mode 100644
index 00000000..5cfc4fc0
--- /dev/null
+++ b/lib/libm/catanh.c
@@ -0,0 +1,6 @@
+#include <complex.h>
+
+double complex catanh(double complex z)
+{
+	return -1.0 * I * catan(z * I);
+}