x-y=1 xy=6 find the value of x^2+y^2
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x−y=−6,xy=4
(x−y)3=x3−y3−3x2y+3xy2=−216
=x3−y3−3yx(x−y)=−216
x3−y3=−216+3(4)(−6)
x3−y3=−288
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