Question

why is any signal expressed in sum of sine and cosine waves for signal processing ?​

Answer 1

Answer:

Fourier series are a way of decomposing a periodic function into sine and cosine functions. Some signals cannot be accurately decompose, and would require an infinitely long series of sine/cosine functions - for example, a square wave function.

Step-by-step explanation:

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Answer 2

Answer:

Fourier series are a way of decomposing a periodic function into sine and cosine functions. Some signals cannot be accurately decompose, and would require an infinitely long series of sine/cosine functions - for example, a square wave function.

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