diff --git a/备课组/26届/校本材料.json b/备课组/26届/校本材料.json
index dfabda05..9b58f410 100644
--- a/备课组/26届/校本材料.json
+++ b/备课组/26届/校本材料.json
@@ -2938,6 +2938,48 @@
             ],
             "remarks": ""
         },
+        "G20260212": {
+            "id": "G20260212",
+            "name": "二倍角公式",
+            "filename": "二倍角公式",
+            "objects": [
+                "K0312001B",
+                "K0312002B",
+                "K0312003B"
+            ],
+            "basicknowledges": [
+                "B00259",
+                "B00260",
+                "B00261",
+                "B00262"
+            ],
+            "examples_basic": [
+                "018393",
+                "018395",
+                "018396"
+            ],
+            "work_inclass": [
+                "018394",
+                "009573",
+                "009574",
+                "009575"
+            ],
+            "homework": [
+                "021579",
+                "021583",
+                "021584",
+                "021585",
+                "018398",
+                "021586",
+                "021587",
+                "021588",
+                "021589",
+                "021591",
+                "021592",
+                "021596"
+            ],
+            "remarks": ""
+        },
         "G20260214": {
             "id": "G20260214",
             "name": "正弦定理",