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Multiple choice
Under Larmor-type precession the Bloch vector traces <X>(t) = cos(wt), <Y>(t) = sin(wt), <Z>(t) = 0. At wt = 2*pi/3, what is <X>(t)?
-1/2 = -0.5
1/2 = 0.5
sqrt(3)/2 ≈ 0.87
-sqrt(3)/2 ≈ -0.87
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