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A197478
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Decimal expansion of least x>0 having cos(x)=(cos 4x)^2.
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2
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6, 6, 5, 3, 7, 5, 3, 1, 9, 8, 2, 0, 6, 9, 4, 5, 9, 9, 9, 4, 1, 0, 9, 7, 6, 2, 4, 1, 4, 1, 6, 9, 7, 3, 2, 1, 2, 9, 4, 4, 4, 0, 0, 4, 9, 3, 7, 5, 9, 6, 0, 2, 5, 5, 6, 0, 6, 2, 0, 9, 0, 9, 6, 7, 4, 4, 0, 1, 3, 1, 7, 1, 1, 4, 8, 5, 3, 7, 9, 5, 5, 8, 6, 5, 1, 2, 8, 2, 4, 6, 6, 5, 1, 3, 5, 5, 6, 3, 9
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OFFSET
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0,1
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COMMENTS
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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.
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LINKS
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EXAMPLE
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x=0.6653753198206945999410976241416973212944400...
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MATHEMATICA
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b = 1; c = 4; f[x_] := Cos[x]
t = x /. FindRoot[f[b*x] == f[c*x]^2, {x, .6, .7}, WorkingPrecision -> 200]
Plot[{f[b*x], f[c*x]^2}, {x, 0, 1}]
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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