A199723 Decimal expansion of x>0 satisfying x^2-2*x*cos(x)=4*sin(x).

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

Author

Clark Kimberling, Nov 09 2011

Keywords

• nonn
• cons

Comments

See A199597 for a guide to related sequences. The Mathematica program includes a graph.

Examples

			1.780608119966635204337801849076666...
		

Links

• Index entries for transcendental numbers.

Crossrefs

Cf. A199597.

Programs

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 *)