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यदि $x, y, z$ शून्येतर वास्तविक संख्याएँ हों तो आव्यूह $A = \left[\begin{array}{lll} x & 0 & 0 \\ 0 & y & 0 \\ 0 & 0 & z \end{array}\right]$ का व्युत्क्रम है: