Does anyone know off-hand which normal arguments cause a subnormal result for a correctly rounded double-precision sin or cos?
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sin(x) with 0 < x < 2^-27
I don't think so. sin(x) ≈ x for small numbers, so sin(2^-27) ≈ 2^-27, which is larger in magnitude than 2^-1022, therefore not subnormal.
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Yes, the numbers I am looking for are (possibly large) doubles that happen to be very close to a multiple of π/2.
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