graph TB
A[Proving the general solution of cos x = cos y]
A --> B[Step 1: Understand the Problem]
A --> C[Step 2: Identify Knowns and Unknowns]
A --> D[Step 3: Formulate a Plan]
A --> E[Step 4: Execute the Plan]
A --> F[Step 5: Verify the Solution]
B --> G[Define cos x and cos y]
C --> H[Identify the variables]
D --> I[Formulate a mathematical model]
E --> J[Execute the mathematical model]
F --> K[Verify the solution against the original problem]

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