diff --git a/client/ios/DivKit/Expressions/Functions/TrigonometricFunctions.swift b/client/ios/DivKit/Expressions/Functions/TrigonometricFunctions.swift
index e4527ba1d..76d64ff69 100644
--- a/client/ios/DivKit/Expressions/Functions/TrigonometricFunctions.swift
+++ b/client/ios/DivKit/Expressions/Functions/TrigonometricFunctions.swift
@@ -11,6 +11,7 @@ extension [String: Function] {
     addFunction("atan", _atanFunction)
     addFunction("toRadians", _toRadians)
     addFunction("toDegrees", _toDegrees)
+    addFunction("cot", _cotFunction)
   }
 }
 
@@ -26,6 +27,14 @@ private let _tanFunction = FunctionUnary { (radians: Double) in
   tan(radians)
 }
 
+private let _cotFunction = FunctionUnary { (radians: Double) in
+  let result = tan(radians)
+  if result.isAlmostZero() {
+    throw ExpressionError("Cotangent is undefined for the given value.")
+  }
+  return 1 / result
+}
+
 private let _asinFunction = FunctionUnary { (value: Double) in
   let result = asin(value)
   if result.isNaN {
diff --git a/test_data/expression_test_data/function_signatures_trigonometry.json b/test_data/expression_test_data/function_signatures_trigonometry.json
index 0ab478a77..3eb095d4c 100644
--- a/test_data/expression_test_data/function_signatures_trigonometry.json
+++ b/test_data/expression_test_data/function_signatures_trigonometry.json
@@ -137,6 +137,20 @@
         "ios",
         "web"
       ]
+    },
+    {
+      "function_name": "cot",
+      "doc": "Calculates the cotangent of the given angle in radians",
+      "arguments": [
+        {
+          "type": "number",
+          "doc": "Angle in radians."
+        }
+      ],
+      "result_type": "number",
+      "platforms": [
+        "ios"
+      ]
     }
   ]
 }
diff --git a/test_data/expression_test_data/functions_trigonometry.json b/test_data/expression_test_data/functions_trigonometry.json
index 366ead322..b4e62af9c 100644
--- a/test_data/expression_test_data/functions_trigonometry.json
+++ b/test_data/expression_test_data/functions_trigonometry.json
@@ -351,6 +351,73 @@
         "ios",
         "web"
       ]
+    },
+    {
+      "expression": "@{cot(0.0)}",
+      "expected": {
+        "type": "error",
+        "value": "Failed to evaluate [cot(0.0)]. Cotangent is undefined for the given value."
+      },
+      "platforms": [
+        "ios"
+      ]
+    },
+    {
+      "expression": "@{cot(pi())}",
+      "expected": {
+        "type": "error",
+        "value": "Failed to evaluate [cot(3.141592653589793)]. Cotangent is undefined for the given value."
+      },
+      "platforms": [
+        "ios"
+      ]
+    },
+    {
+      "expression": "@{cot(pi() / 2)}",
+      "expected": {
+        "type": "number",
+        "value": 0.0
+      },
+      "platforms": [
+        "ios"
+      ]
+    },
+    {
+      "expression": "@{cot(pi() / 4)}",
+      "expected": {
+        "type": "number",
+        "value": 1.0
+      },
+      "platforms": [
+        "ios"
+      ]
+    },
+    {
+      "expression": "@{cot(-pi() / 4)}",
+      "expected": {
+        "type": "number",
+        "value": -1.0
+      },
+      "platforms": [
+        "ios"
+      ]
+    },
+    {
+      "expression": "@{cot(var)}",
+      "expected": {
+        "type": "number",
+        "value": 0.57735026919
+      },
+      "variables": [
+        {
+          "name": "var",
+          "type": "number",
+          "value": 1.0471975512
+        }
+      ],
+      "platforms": [
+        "ios"
+      ]
     }
   ]
 }