if x=4-√5/4+√5 and y=4+√5/4-√5, then find x*2+y*2+xy
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if x=4-√5/4+√5 and y=4+√5/4-√5, then find x*2+y*2+xy
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if x=4-√5/4+√5 and y=4+√5/4-√5