1 files changed, 8 insertions, 0 deletions
diff --git a/lib/libm/cacos.c b/lib/libm/cacos.c
new file mode 100644
index 00000000..1248e72f
--- /dev/null
+++ b/lib/libm/cacos.c
@@ -0,0 +1,8 @@
+#include <math.h>
+#include <complex.h>
+
+double complex cacos(double complex z)
+{
+	double complex w = casin(z);
+	return (M_PI_2 - creal(w)) - cimag(w) * I;
+}