Question

(x²+y²/x²-y²---x²-y²/x²+y²)÷(x+y)(x-y)/(x-y)(x+y)

Answer 1

Answer:

(x + y)² = x² + 2xy + y² ... it's the seecond as the perfect square rule: (x+y)^2=(x +y)(x+y)=x^2+xy+xy+y^2=(x*x)+(x*y)+(y*x)+(y* y).