सिद्ध कीजिए कि \( \left|\begin{array}{lll}x+y & y & z \\ y+z & z & x \\ z+x & x & y\end{array}\r...
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सिद्ध कीजिए कि \( \left|\begin{array}{lll}x+y & y & z \\ y+z & z & x \\ z+x & x & y\end{array}\right|=3 x y z-x^{3}-y^{3}-z^{3} \)
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