A200302 Decimal expansion of greatest x satisfying 4*x^2 - 3*cos(x) = 3*sin(x).

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

Offset

1,4

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: -0.52377415675325572171784049673944...
greatest x: 1.016143956723558733799455901296...

Mathematica

a = 4; b = -3; c = 3;
f[x_] := a*x^2 + b*Cos[x]; g[x_] := c*Sin[x]
Plot[{f[x], g[x]}, {x, -1, 1}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, -.54, -.51}, WorkingPrecision -> 110]
RealDigits[r]   (* A200297 *)
r = x /. FindRoot[f[x] == g[x], {x, 1, 1.05}, WorkingPrecision -> 110]
RealDigits[r]   (* A200298 *)

Prog

(PARI) a=4; b=-3; c=3; solve(x=1, 2, a*x^2 + b*cos(x) - c*sin(x)) \\ G. C. Greubel, Jul 08 2018

Crossrefs

Cf. A199949.

Sequence in context: A212037 A118740 A301431 * A082344 A021865 A198565

Adjacent sequences: A200299 A200300 A200301 * A200303 A200304 A200305

Keyword

nonn,cons

Author

Clark Kimberling, Nov 15 2011

Status

approved