Question

Factorise it
Urgent answer please

Answer 1

Answer:

Step-by-step explanation:= (1-x^2)×(1-y^2)+4xy

= 1×(1-y^2)-x^2(1-y^2)+4xy

= 1-y^2-x^2+x^2 y^2 + 4xy

= (1+2xy+ x^2 y^2) - (y^2 + x^2 - 2xy)

= (1+xy)^2 - (x-y)^2

= [(1+xy)+(x-y)] × [( 1+xy)- (x-y)]

= [(1+x-y + xy) ×( 1-x+y + xy)]