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Mathematics
Problem
Prove that
∣
α
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δ
α
β
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+
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2
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∣
=
0
\begin{vmatrix} \alpha+\beta+\gamma+\delta & \alpha\beta(\gamma+\delta)+\gamma\delta(\alpha+\beta) \\ 2(\alpha+\beta)(\gamma+\delta) & \alpha\beta+\gamma\delta \end{vmatrix} = 0
α
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2
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)
α
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=
0
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