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 fa5b8620..70dd86c8 100644
--- a/备课组/26届/校本材料.json
+++ b/备课组/26届/校本材料.json
@@ -2819,6 +2819,46 @@
             ],
             "remarks": ""
         },
+        "G20260209": {
+            "id": "G20260209",
+            "name": "两角和与差的正弦余弦正切公式(1)",
+            "filename": "两角和与差的正弦余弦正切公式(1)",
+            "objects": [
+                "K0309001B",
+                "K0309002B",
+                "K0309003B"
+            ],
+            "basicknowledges": [
+                "B00254",
+                "B00255"
+            ],
+            "examples_basic": [
+                "018372",
+                "018373",
+                "018375"
+            ],
+            "work_inclass": [
+                "018374",
+                "009564",
+                "009565",
+                "009566"
+            ],
+            "homework": [
+                "021532",
+                "021533",
+                "021534",
+                "021535",
+                "021536",
+                "021537",
+                "021538",
+                "021539",
+                "021540",
+                "021544",
+                "018377",
+                "018376"
+            ],
+            "remarks": ""
+        },
         "G20260214": {
             "id": "G20260214",
             "name": "正弦定理",