A200234 Decimal expansion of greatest x satisfying 3*x^2 - 2*cos(x) = 3*sin(x).

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

Offset

1,3

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: -0.432052760425723131996383607455372280...
greatest x: 1.0929613126196942696433829125566221...

Mathematica

a = 3; b = -2; c = 3;
f[x_] := a*x^2 + b*Cos[x]; g[x_] := c*Sin[x]
Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, -.44, -.43}, WorkingPrecision -> 110]
RealDigits[r]   (* A200233 *)
r = x /. FindRoot[f[x] == g[x], {x, 1.08, 1.09}, WorkingPrecision -> 110]
RealDigits[r]   (* A200234 *)

Prog

(PARI) a=3; b=-2; c=3; solve(x=1, 2, a*x^2 + b*cos(x) - c*sin(x)) \\ G. C. Greubel, Jun 30 2018

Crossrefs

Cf. A199949.

Sequence in context: A217174 A230157 A260646 * A242743 A197812 A146492

Adjacent sequences: A200231 A200232 A200233 * A200235 A200236 A200237

Keyword

nonn,cons

Author

Clark Kimberling, Nov 14 2011

Status

approved