11. Prove the Trigonometric Identity Refer to page 16 of the file for the trigonometric proof question. Prove the identity using appropriate steps and trigonometric properties. Link [https://drive.google.com/file/d/1RQ2OZK-LSxp RyejKEMg 1t2ql5dbpVLCS/view?usp=sharing] Provide a detailed step-by-step explanation. 12. Solve the Differential Equation The differential equation problem can be found on page 18 of the shared file. Solve the equation using an appropriate method (e.g., separation of variables). Link [https://drive.google.com/file/d/1RQ2OZK-LSxp RyejKEMg 1t2ql5dbpVLCS/view?usp=sharing] Ensure a complete and clear solution is provided.

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