(l-m)(m-n)+(m-n)(n-l)-(n-l)(l-m)
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( l -m ) (m - n ) +(m - n) (n-l) - (n -l )(l -m)
=>( m -n ){ l - m +n - l } - (n- l )( l - m)
=>(m - n)(n - m) -(n - l)( l - m )
=> - (m - n)^2 - (n - l) (l - m)
=> -m^2 -n^2 + 2mn + l^2 -l (m+n) +mn
=> l^2 - m^2 - n^2 -l (m+m) +3mn
=>( m -n ){ l - m +n - l } - (n- l )( l - m)
=>(m - n)(n - m) -(n - l)( l - m )
=> - (m - n)^2 - (n - l) (l - m)
=> -m^2 -n^2 + 2mn + l^2 -l (m+n) +mn
=> l^2 - m^2 - n^2 -l (m+m) +3mn
Dharmeshgwalani:
thanks
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