A197482 Decimal expansion of least x>0 having cos(3x)=(cos 2x)^2.

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

Offset

1,2

Comments

The Mathematica program includes a graph. See A197476 for a guide for the least x>0 satisfying cos(b*x)=(cos(c*x))^2 for selected b and c.

Links

Table of n, a(n) for n=1..99.

Example

x=1.843768176031721569639938497723621273145...

Mathematica

b = 3; c = 2; f[x_] := Cos[x]
t = x /. FindRoot[f[b*x] == f[c*x]^2, {x, 1.8, 1.9}, WorkingPrecision -> 200]
RealDigits[t] (* A197482 *)
Plot[{f[b*x], f[c*x]^2}, {x, 0, 2.5}]

Crossrefs

Cf. A197476.

Sequence in context: A071832 A327121 A091475 * A292529 A370000 A154211

Adjacent sequences: A197479 A197480 A197481 * A197483 A197484 A197485

Keyword

nonn,cons

Author

Clark Kimberling, Oct 15 2011

Status

approved