Question

solve this problem ​

Answer 1

collinear formula is

$a( {b}^{2} - {c}^{2} ) + b( {c }^{2} - {a}^{2} ) + c( {a}^{2} - {b}^{2} ) = 0$

Ab squire - AC square+ BC square- BA square+ CA square-CB square

AB square cut BA square , AC square cut

CA square, BC square cut CB square.

then,

0 =0

and the question that that a is not equal to b is not equal to c.