Question

Упростить выражение 
 ((x^4-y^4)/(x^2+y^2-2*x*y))*((x-y)/(xy+x^2))

Answer 1

$frac{(x-y)(x+y)( x^{2} + y^{2} )}{ (x-y)^{2}* frac{x-y}{x(x+y)} } =$$frac{x (x+y)^{2}( x^{2} + y^{2} ) }{ (x-y)^{2} }$