diff --git a/d.java b/d.java
new file mode 100644
index 0000000..957cbf2
--- /dev/null
+++ b/d.java
@@ -0,0 +1,23 @@
+public class d {
+    public static double angle(double a, String b) {
+        double c = Math.toRadians(a);
+        if (a % 180 == 0 && b.equals("sin")) {
+            return 0;
+        }
+        if (a % 90 == 0 && a % 180 != 0 && b.equals("cos")) {
+            return 0;
+        }
+
+        switch (b) {
+            case "cos":
+                return Math.cos(c);
+            case "sin":
+                return Math.sin(c);
+            case "tan":
+                return Math.tan(c);
+            case "cot":
+                return 1 / Math.tan(c);
+        }
+        return -1;
+    }
+}