A200022 Decimal expansion of least x satisfying x^2 - 2*cos(x) = 3*sin(x) (negated).

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

Offset

0,1

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 = 0..10000

Example

least x:  -0.5145148304764586865656389456753718159521...
greatest x: 1.669692169649763458252838305984917335937...

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, 0, a*x^2 + b*cos(x) - c*sin(x)) \\ G. C. Greubel, Jun 24 2018

Crossrefs

Cf. A199949.

Sequence in context: A019977 A169978 A068468 * A216157 A216851 A179290

Adjacent sequences: A200019 A200020 A200021 * A200023 A200024 A200025

Keyword

nonn,cons

Author

Clark Kimberling, Nov 13 2011

Status

approved