OFFSET
0,1
COMMENTS
See A198755 for a guide to related sequences. The Mathematica program includes a graph.
EXAMPLE
x=0.44795830764740687230976418404518540235389753...
MAPLE
Digits:=100: fsolve(4*x^2-2*cos(x)=-1, x); # Wesley Ivan Hurt, Feb 09 2017
MATHEMATICA
a = 4; b = -2; c = -1;
f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, .44, .45}, WorkingPrecision -> 110]
RealDigits[r] (* A198991 *)
PROG
(PARI) solve(x=0, 1, 4*x^2 - 2*cos(x) + 1) \\ Michel Marcus, Feb 09 2017
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Nov 01 2011
STATUS
approved