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A196402
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Decimal expansion of the least positive number x satisfying e^(-x)=2*cos(x).
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6
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1, 4, 5, 3, 6, 7, 3, 6, 6, 6, 4, 6, 1, 0, 4, 1, 6, 1, 8, 6, 8, 4, 3, 4, 3, 5, 6, 8, 1, 2, 7, 3, 4, 0, 0, 6, 4, 4, 5, 9, 5, 8, 8, 0, 6, 1, 9, 2, 1, 7, 4, 2, 7, 6, 2, 5, 6, 3, 4, 2, 4, 5, 1, 1, 3, 4, 3, 4, 1, 5, 8, 0, 3, 6, 1, 6, 5, 2, 4, 5, 9, 9, 3, 9, 8, 5, 4, 6, 5, 2, 6, 4, 3, 0, 8, 0, 5, 7, 3, 4
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OFFSET
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1,2
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LINKS
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EXAMPLE
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x=1.45367366646104161868434356812734006445958806...
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MATHEMATICA
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Plot[{E^(-x), Cos[x], 2 Cos[x], 3 Cos[x], 4 Cos[x]}, {x, 0, Pi/2}]
t = x /. FindRoot[E^(-x) == Cos[x], {x, 1, 1.6}, WorkingPrecision -> 100];
t = x /. FindRoot[E^(-x) == 2 Cos[x], {x, 1, 1.6}, WorkingPrecision -> 100]; RealDigits[t] (* A196402 *)
t = x /. FindRoot[E^(-x) == 3 Cos[x], {x, 1, 1.6}, WorkingPrecision -> 100]; RealDigits[t] (* A196403 *)
t = x /. FindRoot[E^(-x) == 4 Cos[x], {x, 1, 1.6}, WorkingPrecision -> 100]; RealDigits[t] (* A196404 *)
t = x /. FindRoot[E^(-x) == 5 Cos[x], {x, 1, 1.6}, WorkingPrecision -> 100]; RealDigits[t] (* A196405 *)
t = x /. FindRoot[E^(-x) == 6 Cos[x], {x, 1, 1.6}, WorkingPrecision -> 100]; RealDigits[t] (* A196406 *)
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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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