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*This is often called the Polygamma function.
*This is often called the Polygamma function.
*Gamma, Lgamma, Digamma and Trigamma functions are internal generic primitive functions.
*Gamma, Lgamma, Digamma and Trigamma functions are internal generic primitive functions.
*Normally the number <math>e</math> to the power <math>GAMMALN(x)</math>, where <math>x</math> is an integer, is same as <math>(x-1)!</math>.
*Normally the number <math>e^{GAMMALN(x)}</math>, where <math>x</math> is an integer, is same as <math>(x-1)!</math>.
:<math>GAMMALN=LN(GAMMA(x))</math>,
:<math>GAMMALN=LN(GAMMA(x))</math>,
where
where