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A200293
Decimal expansion of least x satisfying 4*x^2 - 2*cos(x) = sin(x), negated.
3
5, 4, 5, 5, 9, 7, 3, 8, 8, 4, 8, 1, 4, 7, 5, 7, 3, 9, 5, 0, 4, 2, 1, 4, 8, 8, 4, 7, 8, 5, 7, 7, 0, 8, 2, 9, 5, 6, 7, 1, 6, 1, 0, 9, 4, 3, 0, 5, 0, 7, 0, 8, 5, 7, 7, 6, 2, 5, 1, 5, 3, 7, 5, 2, 4, 9, 3, 9, 3, 1, 6, 9, 6, 6, 6, 8, 7, 1, 7, 6, 5, 7, 1, 8, 2, 1, 1, 6, 7, 3, 3, 3, 3, 5, 7, 9, 4, 4, 5
OFFSET
0,1
COMMENTS
See A199949 for a guide to related sequences. The Mathematica program includes a graph.
LINKS
EXAMPLE
least x: -0.5455973884814757395042148847857...
greatest x: 0.73397262794028961433450505600...
MATHEMATICA
a = 4; b = -2; c = 1;
f[x_] := a*x^2 + b*Cos[x]; g[x_] := c*Sin[x]
Plot[{f[x], g[x]}, {x, -1, 1}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, -.55, -.54}, WorkingPrecision -> 110]
RealDigits[r] (* A200293 *)
r = x /. FindRoot[f[x] == g[x], {x, .73, .74}, WorkingPrecision -> 110]
RealDigits[r] (* A200294 *)
PROG
(PARI) a=4; b=-2; c=1; solve(x=-1, 0, a*x^2 + b*cos(x) - c*sin(x)) \\ G. C. Greubel, Jul 08 2018
CROSSREFS
Cf. A199949.
Sequence in context: A001050 A113784 A021651 * A211006 A358789 A069214
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Nov 15 2011
STATUS
approved