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If |[b^2+c^2,a b,a c],[ a b, c^2+a^2,b c...

If `|[b^2+c^2,a b,a c],[ a b, c^2+a^2,b c],[c a, c b, a^2+b^2]|=k a^2b^2c^2,` then the value of `k` is `a b c` b. `a^2b^2c^2` c. `b c+c a+a b` d. none of these

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