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plgndr.h

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/* Returns the value of the associated Legendre polynomial P_l^m(x) for -1 <= x <= 1 and 0 <= m <= l */
extern double plgndr(int l, int m, double x);

/* Returns the value of the spherical harmonic Y_l^m(theta, 0) */
extern double sphericalY(int l, int m, double theta);

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