A200284 Decimal expansion of greatest x satisfying 3*x^2 - 4*cos(x) = 4*sin(x), negated.

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

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: -0.5959294541202234263223480673526214...
greatest x: 1.28612802674590996527915112614637...

Mathematica

a = 3; b = -4; c = 4;
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, -.6, -.59}, WorkingPrecision -> 110]
RealDigits[r]    (* A200283 *)
r = x /. FindRoot[f[x] == g[x], {x, 1.2, 1.3}, WorkingPrecision -> 110]
RealDigits[r]   (* A200284 *)

Prog

(PARI) a=3; b=-4; c=4; solve(x=-1, 0, a*x^2 + b*cos(x) - c*sin(x)) \\ G. C. Greubel, Jul 07 2018

Crossrefs

Cf. A199949.

Sequence in context: A096417 A274416 A011059 * A019771 A264643 A016594

Adjacent sequences: A200281 A200282 A200283 * A200285 A200286 A200287

Keyword

nonn,cons

Author

Clark Kimberling, Nov 15 2011

Status

approved