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કોઈ પણ વાસ્તવિક કિમત $x$ એ $ - 1 < x < 1,$ માટે $A(x)\,=\, {(1 - x)^{ - 1}}\left[ {\begin{array}{*{20}{c}}1&{ - x}\\{ - x}&1\end{array}} \right]$ અને $z = \frac{{x + y}}{{1 + xy}}$ તો