Question

 

prove using property of determinant

1.  a+b+c      -c                 -b

   -c               a+b+c           -a                   =  2(a+b)( b+c ) (c+a)

  -b              -a                     a+b+c

Joshi sir comment

first use C1 = C1+C2+C3

then R1 = R1+R2 and R2 = R2+R3

after it solve mathematically

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