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A199723
Decimal expansion of x>0 satisfying x^2-2*x*cos(x)=4*sin(x).
2
1, 7, 8, 0, 6, 0, 8, 1, 1, 9, 9, 6, 6, 6, 3, 5, 2, 0, 4, 3, 3, 7, 8, 0, 1, 8, 4, 9, 0, 7, 6, 6, 6, 6, 9, 2, 2, 1, 7, 0, 4, 2, 1, 7, 2, 5, 7, 3, 1, 8, 2, 1, 6, 4, 4, 5, 0, 6, 1, 2, 5, 1, 4, 5, 5, 7, 4, 8, 0, 4, 1, 0, 5, 0, 9, 3, 6, 1, 6, 8, 3, 3, 2, 8, 5, 0, 1, 3, 2, 4, 6, 4, 7, 8, 4, 6, 5, 9, 5
OFFSET
1,2
COMMENTS
See A199597 for a guide to related sequences. The Mathematica program includes a graph.
EXAMPLE
x=1.780608119966635204337801849076666...
MATHEMATICA
a = 1; b = -2; c = 4;
f[x_] := a*x^2 + b*x*Cos[x]; g[x_] := c*Sin[x]
Plot[{f[x], g[x]}, {x, -2 Pi, Pi}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, 1.78, 1.79}, WorkingPrecision -> 110]
RealDigits[r] (* A199723 *)
CROSSREFS
Cf. A199597.
Sequence in context: A333972 A088396 A371947 * A359255 A188485 A093828
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Nov 09 2011
STATUS
approved