If a, b, c, are real numbers, and D=|[ a 1+2 i 3-5 i; 1-2 i b -7-3 i; 3+5 i -7+3 i ...

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If a, b, c, are real numbers, and D=|[ a 1+2 i 3-5 i; 1-2 i b -7-3 i; 3+5 i -7+3 i c ]| then show that D is purely real.

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