A200023 Decimal expansion of greatest x satisfying x^2 - 2*cos(x) = 3*sin(x).

1, 6, 6, 9, 6, 9, 2, 1, 6, 9, 6, 4, 9, 7, 6, 3, 4, 5, 8, 2, 5, 2, 8, 3, 8, 3, 0, 5, 9, 8, 4, 9, 1, 7, 3, 3, 5, 9, 3, 7, 7, 5, 8, 9, 9, 6, 5, 9, 1, 6, 9, 9, 1, 6, 8, 2, 8, 2, 4, 0, 8, 4, 9, 6, 1, 1, 2, 9, 1, 0, 5, 6, 2, 3, 4, 4, 1, 3, 3, 4, 1, 9, 3, 2, 5, 7, 8, 3, 8, 7, 2, 9, 5, 5, 6, 9, 3, 4, 7

Offset

1,2

Comments

See A199949 for a guide to related sequences. The Mathematica program includes a graph.

Links

G. C. Greubel, Table of n, a(n) for n = 1..10000

Example

least x:  -0.514514830476458686565638945675371815952...
greatest x: 1.66969216964976345825283830598491733593...

Mathematica

a = 1; b = -2; c = 3;
f[x_] := a*x^2 + b*Cos[x]; g[x_] := c*Sin[x]
Plot[{f[x], g[x]}, {x, -1, 2}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, -.52, -.51}, WorkingPrecision -> 110]
RealDigits[r]  (* A200022 *)
r = x /. FindRoot[f[x] == g[x], {x, 1.66, 1.67}, WorkingPrecision -> 110]
RealDigits[r]  (* A200023 *)

Prog

(PARI) a=1; b=-2; c=3; solve(x=1, 2, a*x^2 + b*cos(x) - c*sin(x)) \\ G. C. Greubel, Jun 24 2018

Crossrefs

Cf. A199949.

Sequence in context: A250721 A065480 A198116 * A339705 A337607 A379468

Adjacent sequences: A200020 A200021 A200022 * A200024 A200025 A200026

Keyword

nonn,cons

Author

Clark Kimberling, Nov 13 2011

Status

approved