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A019970
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Decimal expansion of tangent of 72 degrees.
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11
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3, 0, 7, 7, 6, 8, 3, 5, 3, 7, 1, 7, 5, 2, 5, 3, 4, 0, 2, 5, 7, 0, 2, 9, 0, 5, 7, 6, 0, 3, 6, 9, 0, 9, 8, 2, 4, 0, 0, 6, 7, 0, 2, 1, 4, 3, 5, 3, 7, 7, 9, 2, 4, 2, 7, 0, 3, 9, 1, 5, 6, 2, 5, 0, 3, 7, 4, 8, 6, 3, 2, 8, 8, 4, 9, 5, 0, 9, 0, 9, 1, 8, 4, 5, 4, 5, 9, 3, 7, 2, 1, 6, 6, 7, 1, 0, 5, 4, 3
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OFFSET
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1,1
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COMMENTS
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Length of the second longest diagonal in a regular 10-gon with unit side. - Mohammed Yaseen, Nov 12 2020
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LINKS
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FORMULA
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Equals tan(66 degrees) + tan(36 degrees) + tan(6 degrees). - Amiram Eldar, Apr 07 2022
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EXAMPLE
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3.077683537175253402570290576036909824006702143537792427...
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MATHEMATICA
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RealDigits[Tan[72 Degree], 10, 120][[1]] (* Harvey P. Dale, Apr 30 2012 *)
RealDigitis[Sqrt[5 + 2*Sqrt[5]], 10, 100][[1]] (* G. C. Greubel, Nov 21 2018 *)
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PROG
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(Magma) SetDefaultRealField(RealField(100)); Sqrt(5+2*Sqrt(5)); // G. C. Greubel, Nov 21 2018
(Sage) numerical_approx(tan(2*pi/5), digits=100) # G. C. Greubel, Nov 21 2018
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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