A019940 Decimal expansion of tangent of 42 degrees.
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
Offset: 0
Examples
0.900404044297839945120477203885371702076466211299485282427079...
Links
- Ivan Panchenko, Table of n, a(n) for n = 0..1000
- Wikipedia, Exact trigonometric constants
Crossrefs
Cf. A019851 (sine of 42 degrees)
Programs
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Magma
SetDefaultRealField(RealField(100)); R:= RealField(); Tan(7*Pi(R)/30); // G. C. Greubel, Nov 25 2018
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Mathematica
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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PARI
default(realprecision, 100); tan(7*Pi/30) \\ G. C. Greubel, Nov 25 2018
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Sage
numerical_approx(tan(7*pi/30), digits=100) # G. C. Greubel, Nov 25 2018
Formula
Equals sqrt(7 + 2*sqrt(5) - 2*sqrt(3*(5 + 2*sqrt(5)))). - G. C. Greubel, Nov 25 2018
Comments