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31−2δ11−2δ1+31−2δ21−2δ2+31−2δ31−2δ3 \dfrac{31-2\delta_{1}}{1-2\delta_{1}} +\dfrac{31-2\delta_{2}}{1-2\delta_{2}}+\dfrac{31-2\delta_{3}}{1-2\delta_{3}} 1−2δ131−2δ1+1−2δ231−2δ2+1−2δ331−2δ3
If 1,δ1,δ2,δ31,\delta_{1},\delta_{2},\delta_{3}1,δ1,δ2,δ3 are distinct fourth roots of unity, then evaluate the expression above.
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