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1: 28.21 Graphics
2: 20.3 Graphics
3: 7.3 Graphics
4: 14.22 Graphics
5: 23.16 Graphics
6: 25.20 Approximations
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Cody et al. (1971) gives rational approximations for in the form of quotients of polynomials or quotients of Chebyshev series. The ranges covered are , , , . Precision is varied, with a maximum of 20S.
Piessens and Branders (1972) gives the coefficients of the Chebyshev-series expansions of and , , for (23D).