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\end{align}
</math>
In particular, <math>X_{2r}</math> is finite whereas <math>Y_{2r}</math> diverges. Writing <math>A_{2r} = c_1 X_{2r} + c_2 Y_{2r}</math>, we therefore see that in order for the Fourier series representation of <math>\text{ce}_{2n}</math> to converge, <math>a</math> must be chosen such that <math>c_2 = 0.</math>
In general, however, the solution of a three-term recurrence with variable coefficients
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