Question

Find the value of 1/2(a+b+c)[(a-b)^2+(b-c)^2+(c-a)^2]

Answer 1

1/2(a + b+ c){(a -b)² + ( b -c)² + ( c -a)² }

actually this is formula,
a³ + b³ + c³ -3abc = 1/2(a + b+ c){ ( a-b)² + ( b -c)² + ( c - a)² }