Question

x^2*y^2+1-y^2-x^2 разложите на множители

Answer 1

x²y² +1 -y²-x²=x²y²-y² + 1-x²=y²(x²-1)- (x²-1)=
=(x²-1)(y²-1)=(x+1)(x-1)(y+1)(y-1)