x^2-y^2-xy from 1+x^2+y^2 Subtract them
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please thanks to my previous question please please please please please please
(1+x^2+y^2)-(x^2-y^2-xy)
= 1+x^2+y^2-x^2-y^2-xy
= 1-xy
it is your answer because x square and minus x square get cancelled and + Y square and minus y square get cancelled then it remain 1 - x y
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