1 files changed, 8 insertions, 0 deletions
diff --git a/lib/libm/csin.c b/lib/libm/csin.c
new file mode 100644
index 00000000..1299f10a
--- /dev/null
+++ b/lib/libm/csin.c
@@ -0,0 +1,8 @@
+#include "__complex.h"
+
+double complex csin(double complex z)
+{
+	double ch, sh;
+	cchsh(cimag(z), &ch, &sh);
+	return sin(creal(z)) * ch + (cos(creal(z)) * sh) * (double complex)I;
+}