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A200106
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Decimal expansion of greatest x satisfying x^2 - 4*cos(x) = 4*sin(x).
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3
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1, 7, 6, 9, 5, 6, 8, 8, 7, 4, 3, 7, 2, 7, 0, 1, 7, 4, 9, 1, 1, 5, 0, 7, 8, 4, 6, 2, 0, 0, 1, 6, 2, 7, 7, 5, 4, 7, 6, 5, 5, 5, 3, 4, 1, 0, 5, 3, 8, 0, 6, 4, 0, 4, 0, 5, 3, 9, 9, 1, 8, 7, 9, 8, 4, 0, 5, 9, 5, 2, 4, 5, 4, 0, 9, 7, 9, 4, 2, 2, 5, 4, 4, 0, 2, 3, 5, 1, 2, 0, 1, 4, 4, 1, 5, 7, 7, 4, 0
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OFFSET
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1,2
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COMMENTS
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See A199949 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 x: -0.698933604732903309337989544733567956233...
greatest x: 1.7695688743727017491150784620016277547...
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MATHEMATICA
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a = 1; b = -4; c = 4;
f[x_] := a*x^2 + b*Cos[x]; g[x_] := c*Sin[x]
Plot[{f[x], g[x]}, {x, -3, 3}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, -.7, -.6}, WorkingPrecision -> 110]
r = x /. FindRoot[f[x] == g[x], {x, 1.76, 1.77}, WorkingPrecision -> 110]
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PROG
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(PARI) a=1; b=-4; c=4; solve(x=1, 2, a*x^2 + b*cos(x) - c*sin(x)) \\ G. C. Greubel, Jun 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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