A200121 Decimal expansion of greatest x satisfying 2*x^2 - 3*cos(x) = sin(x).

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

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: -0.815233223410514131205921200022220970300...
greatest x: 1.0743092065060468901083577789286306342...

Mathematica

a = 2; b = -3; c = 1;
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, -.82, -.81}, WorkingPrecision -> 110]
RealDigits[r]  (* A200120 *)
r = x /. FindRoot[f[x] == g[x], {x, 1.07, 1.08}, WorkingPrecision -> 110]
RealDigits[r]  (* A200121 *)

Prog

(PARI) a=2; b=-3; c=1; solve(x=1, 2, a*x^2 + b*cos(x) - c*sin(x)) \\ G. C. Greubel, Jun 29 2018

Crossrefs

Cf. A199949.

Sequence in context: A248750 A071875 A200687 * A198348 A019857 A363093

Adjacent sequences: A200118 A200119 A200120 * A200122 A200123 A200124

Keyword

nonn,cons

Author

Clark Kimberling, Nov 14 2011

Status

approved