If y=|(f(x),g(x),h(x)),(l,m,n),(a, b,c)|...

If `y=|(f(x),g(x),h(x)),(l,m,n),(a, b,c)|`, prove that, `(dy)/(dx)=|(f'(x),g'(x),h'(x)),(l,m,n),(a, b,c)|`

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