If x+y=-1 and xy =-12, find the value of
(a) (x+1)(y+1) ,
(b) x² + y² ,
(c) (x-y)² .
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If x+y=-1 and xy =-12, find the value of
(a) (x+1)(y+1) ,
(b) x² + y² ,
(c) (x-y)² .
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