Can fourier sine series approximate even functions?

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SUMMARY

A Fourier sine series cannot approximate even functions, such as cos(x) or x², due to the nature of the sine function being odd. The sine coefficients for even functions are zero, as the product of an even function and an odd function results in an odd function. Therefore, when applying the Fourier sine series, the calculation for the sine coefficients yields zero, rendering it ineffective for modeling purely even functions.

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TheCanadian
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I am learning Fourier series and have come across the sine, cosine, and imaginary exponential expressions. To my knowledge, these individual terms form a basis since they are all orthogonal to each other. I am just wondering: can a Fourier sine series be used to model a purely even function, such as cosx or ## x^2##? Are there any limitations with using a Fourier sine series on even functions?
 
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No. The coefficient of the sine term is zero for an even function. If f is even, and taking into account that the product of an even and odd function is odd, then you can see that the calculation for the sine coefficient yields 0 when you use the formula for the coefficients.
 
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