=Taking 3 common from C1 and C3, we get,
Solving the determinant we get,
= 9 [ – 1(yz – 0) + x(y + 3zy + z)]
= 9(yz + xy + 3xyz + xz)
9(3xyz + xy + yz + xz) = RHS
∵ LHS = RHS
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