A197586 - OEIS

A197586

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

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

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OFFSET

0,1

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=0..98.

EXAMPLE

x=0.3226477637734245926813896345699080965614970733550...

MATHEMATICA

b = 3*Pi; c = 1; f[x_] := Sin[x]

t = x /. FindRoot[f[b*x] == f[c*x]^2, {x, .32, .33}, WorkingPrecision -> 200]