सिद्ध कीजिए कि \( \left|\begin{array}{ccc}y+k & y & y \\ y & y+k & y \\ y & y & y+k\end{array}\r...

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सिद्ध कीजिए कि \( \left|\begin{array}{ccc}y+k & y & y \\ y & y+k & y \\ y & y & y+k\end{array}\right|=k^{2}(3 y+k) \)
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