Question 1120656
?
{{{x=X}}}

{{{y=Y}}}


{{{x<>X}}}


{{{y<>Y}}}


Which?


Putting variables only lower-case,

{{{(x-y)^2=x^2+y^2-2xy}}}

{{{2*2=52-2xy}}}

{{{2=26-xy}}}

{{{-24=-xy}}}

{{{highlight(24=xy)}}}