A200236 Decimal expansion of greatest x satisfying 3*x^2 - 2*cos(x) = 4*sin(x).

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

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: -0.37112234946927280533419999688093...
greatest x: 1.217245428945459027693245863545...

Mathematica

a = 3; b = -2; 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, -.38, -.37}, WorkingPrecision -> 110]
RealDigits[r]   (* A200235 *)
r = x /. FindRoot[f[x] == g[x], {x, 1.2, 1.3}, WorkingPrecision -> 110]
RealDigits[r]   (* A200236 *)

Prog

(PARI) a=3; b=-2; c=4; solve(x=1, 2, a*x^2 + b*cos(x) - c*sin(x)) \\ G. C. Greubel, Jul 05 2018

Crossrefs

Cf. A199949.

Sequence in context: A317547 A089329 A213053 * A292191 A239155 A097411

Adjacent sequences: A200233 A200234 A200235 * A200237 A200238 A200239

Keyword

nonn,cons

Author

Clark Kimberling, Nov 14 2011

Status

approved