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A019940
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Decimal expansion of tangent of 42 degrees.
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1
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9, 0, 0, 4, 0, 4, 0, 4, 4, 2, 9, 7, 8, 3, 9, 9, 4, 5, 1, 2, 0, 4, 7, 7, 2, 0, 3, 8, 8, 5, 3, 7, 1, 7, 0, 2, 0, 7, 6, 4, 6, 6, 2, 1, 1, 2, 9, 9, 4, 8, 5, 2, 8, 2, 4, 2, 7, 0, 7, 9, 0, 8, 3, 9, 2, 2, 4, 0, 1, 7, 1, 4, 2, 5, 2, 5, 0, 2, 5, 3, 1, 8, 6, 2, 6, 3, 1, 1, 5, 9, 8, 6, 6, 3, 3, 8, 2, 8, 3
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OFFSET
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0,1
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COMMENTS
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Also the decimal expansion of cotangent of 48 degrees. - Ivan Panchenko, Sep 01 2014
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LINKS
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FORMULA
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Equals sqrt(7 + 2*sqrt(5) - 2*sqrt(3*(5 + 2*sqrt(5)))). - G. C. Greubel, Nov 25 2018
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EXAMPLE
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0.900404044297839945120477203885371702076466211299485282427079...
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MATHEMATICA
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RealDigits[Tan[42 Degree], 10, 120][[1]] (* Harvey P. Dale, Sep 05 2012 *)
RealDigits[Tan[7*Pi/30], 10, 100][[1]] (* G. C. Greubel, Nov 25 2018 *)
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PROG
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(PARI) default(realprecision, 100); tan(7*Pi/30) \\ G. C. Greubel, Nov 25 2018
(Magma) SetDefaultRealField(RealField(100)); R:= RealField(); Tan(7*Pi(R)/30); // G. C. Greubel, Nov 25 2018
(Sage) numerical_approx(tan(7*pi/30), digits=100) # G. C. Greubel, Nov 25 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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