A200307 Decimal expansion of least x satisfying 4*x^2 - 4*cos(x) = 3*sin(x), negated.

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

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: -0.6174065144201321316882984350723098...
greatest x: 1.06740848569359172383926056700706...

Mathematica

a = 4; b = -4; 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, -.62, -.63}, WorkingPrecision -> 110]
RealDigits[r]   (* A200307 *)
r = x /. FindRoot[f[x] == g[x], {x, 1.0, 1.1}, WorkingPrecision -> 110]
RealDigits[r]   (* A200308 *)

Prog

(PARI) a=4; b=-4; c=3; solve(x=-1, 0, a*x^2 + b*cos(x) - c*sin(x)) \\ G. C. Greubel, Jul 10 2018

Crossrefs

Cf. A199949.

Sequence in context: A137235 A021166 A131231 * A260632 A330062 A198420

Adjacent sequences: A200304 A200305 A200306 * A200308 A200309 A200310

Keyword

nonn,cons

Author

Clark Kimberling, Nov 16 2011

Status

approved