1 files changed, 21 insertions, 0 deletions
diff --git a/winsup/mingw/mingwex/complex/csin.c b/winsup/mingw/mingwex/complex/csin.c
new file mode 100644
index 000000000..37df8057e
--- /dev/null
+++ b/winsup/mingw/mingwex/complex/csin.c
@@ -0,0 +1,21 @@
+/*  csin.c */
+
+/*
+   Contributed by Danny Smith
+   2003-10-20
+*/
+
+#include <math.h>
+#include <complex.h>
+
+/* csin (x + I * y) = sin (x) * cosh (y)
+    + I * (cos (x) * sinh (y)) */ 
+
+double complex csin (double complex Z)
+{
+  double complex Res;
+  __real__ Res = sin (__real__ Z) * cosh ( __imag__ Z);
+  __imag__ Res = cos (__real__ Z) * sinh ( __imag__ Z);
+  return Res;
+}
+