1 files changed, 9 insertions, 0 deletions
diff --git a/src/c/elementaryFunctions/Trigonometry/cotd/dcotds.c b/src/c/elementaryFunctions/Trigonometry/cotd/dcotds.c
new file mode 100644
index 00000000..4ba95b84
--- /dev/null
+++ b/src/c/elementaryFunctions/Trigonometry/cotd/dcotds.c
@@ -0,0 +1,9 @@
+#include <math.h>
+#include "cotd.h"
+
+double dcotds(double in)
+{
+if(in==0)
+printf("Inf\n");
+  return (1/tan((M_PI/180.0)*in));
+}