factorise 1) 1/16x^2+1/4y^2+1-1/4 x y-y+1/2x
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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^2y^2+4xy
=(1+2xy/x^2y^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)]
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