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If det ( 1 a 2 b ) = 4 \det\left(\begin{array}{cc}1& a\\2& b \end{array}\right)=4 det(12ab)=4and det ( 1 b 2 a ) = 1 , \det\left(\begin{array}{cc}1& b\\2& a \end{array}\right)=1, det(12ba)=1,what is a 2 + b 2 ? a^2+b^2? a2+b2?
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