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A199452 Decimal expansion of x>0 satisfying 3*x^2+3*x*sin(x)=cos(x). 2

%I #5 Mar 30 2012 18:57:57

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

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

%U 4,6,5,8,6,5,5,8,9,7,3,3,3,9,0,7,3,6,7,8,6,9,9,1,4,1,7,4,7,8,7

%N Decimal expansion of x>0 satisfying 3*x^2+3*x*sin(x)=cos(x).

%C See A199370 for a guide to related sequences. The Mathematica program includes a graph.

%e x=0.3947848449412859978152735362899570255347172211...

%t a = 3; b = 3; c = 1;

%t f[x_] := a*x^2 + b*x*Sin[x]; g[x_] := c*Cos[x]

%t Plot[{f[x], g[x]}, {x, -Pi, Pi}, {AxesOrigin -> {0, 0}}]

%t r = x /. FindRoot[f[x] == g[x], {x, .39, .40}, WorkingPrecision -> 110]

%t RealDigits[r] (* A199452 *)

%Y Cf. A199429.

%K nonn,cons

%O 0,1

%A _Clark Kimberling_, Nov 06 2011

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