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What is the difference between an artificial and natural harmonic on guitar? IF ARG (Z-1)=π/6AND ARG (Z+1)=2 π/3 THEN PROVE THAT [Z]=1? Is 0.7 repeating rational number? Please answer this Geometry question? So this bird came on my fiancée porch and it won t leave. We even took a broom and it left keeps coming back. It s a pigeon. Crazy? A sign?