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If by change of axes without change of origin, the expression `ax^(2)+2hxy+by^(2)` becomes `a_(1)x_(1)^(2)+2h_(1)x_(1)y_(1)+b_(1)y_(1)^(2)`, prove that
`ab-h^(2)=a_(1)b_(1)-h_(1)^(2)`

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