graph TB
A["Deriving formulas"] --> B["cos A ± cos B"]
A --> C["sin A ± sin B"]
B --> D["cos A + cos B"]
B --> E["cos A - cos B"]
C --> F["sin A + sin B"]
C --> G["sin A - sin B"]
D --> H["2cos((A+B)/2)cos((A-B)/2)"]
E --> I["-2sin((A+B)/2)sin((A-B)/2)"]
F --> J["2sin((A+B)/2)cos((A-B)/2)"]
G --> K["2cos((A+B)/2)sin((A-B)/2)"]

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