Fourier Series Lecture 4: Orthogonality of Sine & Cosine + Solved Problems!

this 4th lecture on Fourier Series, we dive deep into the orthogonality of sine and cosine functions, a fundamental concept that makes Fourier series work! We’ll cover:
✅ What does orthogonality mean in Fourier series?
✅ Mathematical proof of orthogonality of sine & cosine functions
✅ Key integrals you must know for Fourier coefficients
✅ Solved problems applying orthogonality in Fourier series

💡 Why Watch This?
✔ Clear explanations with visual proofs
✔ Problem-solving approach for exams & assignments
✔ Builds foundation for advanced Fourier analysis

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