W nkcsft2

The rotational perturbation (B.87) of the frequency can thus be written as

From now on, we assume that Q is only a function of r (for the general case see [131]). We use the orthogonality of the Legendre polynomials, p^pT-x

H - - (2£ + 1)(£ - m)! where 8k,£ is here the Kronecker symbol. The last term in (B.97) gives

xPpT(x)dPi

The second term is given by (B.101). We also note that

This can be used to express the term in square bracket in (B.97),

sin2 ft

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