`I have a terms written below
$((x_1-x_2)(y_2-y_3)-(x_2-x_3)(y_1-y_2))^2$
Also i am given vertices of equilateral triangle with side $a$ and vertices as $(x_1,y_1),(x_2,y_2),(x_3,y_3)$. I am to write above term in terms of $a$.I tried using distance formula for equilateral triangle and then to eliminate $x_i$ in original term , but it didnot work out.
Any suggestions
Thanks