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A199737
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Decimal expansion of least x satisfying x^2-4*x*cos(x)=sin(x).
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3
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3, 6, 4, 1, 7, 3, 6, 5, 1, 0, 4, 2, 3, 2, 0, 3, 0, 8, 9, 1, 5, 6, 8, 0, 1, 7, 1, 2, 1, 9, 1, 6, 8, 8, 9, 1, 9, 4, 7, 4, 4, 1, 5, 6, 3, 0, 6, 1, 3, 8, 5, 4, 5, 6, 9, 0, 8, 9, 9, 4, 2, 4, 5, 1, 9, 9, 5, 8, 6, 1, 0, 9, 4, 0, 3, 4, 5, 1, 0, 1, 0, 9, 8, 2, 7, 9, 2, 6, 9, 6, 7, 0, 5, 5, 8, 2, 4, 5, 1
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OFFSET
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1,1
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COMMENTS
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See A199597 for a guide to related sequences. The Mathematica program includes a graph.
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LINKS
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EXAMPLE
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least: -3.6417365104232030891568017121916889194744...
greatest: 1.39694868354568477235286357946526821398...
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MATHEMATICA
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a = 1; b = -4; c = 1;
f[x_] := a*x^2 + b*x*Cos[x]; g[x_] := c*Sin[x]
Plot[{f[x], g[x]}, {x, -4, 2}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, -3.7, -3.6}, WorkingPrecision -> 110]
RealDigits[r] (* A199737 least root *)
r = x /. FindRoot[f[x] == g[x], {x, 1.39, 1.40}, WorkingPrecision -> 110]
RealDigits[r] (* A199738 greatest root *)
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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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