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This routine computes the exponential integral \(\operatorname{E_1}(x)\),
This routine computes the second-order exponential integral \(\operatorname{E_2}(x)\),
This routine computes the exponential integral \(\operatorname{E_n}(x)\) of order \(n\),
These routines compute the exponential integral \(\operatorname{Ei}(x)\),
where \(PV\) denotes the principal value of the integral.
This routine computes the integral
where \(\gamma_E\) is the Euler constant.
This routine computes the third-order exponential integral
This routine computes the Sine integral
This routine computes the Cosine integral
This routine computes the Arctangent integral, which is defined as
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Fermi-Dirac Function