let x and y be two real numbers such that x>0 and xy=1. the minimum value of x+y is
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x=-1 and y= -1 as
-1>0 and -1*-1 = 1
x + y = -1+(-1)
=-2
-1>0 and -1*-1 = 1
x + y = -1+(-1)
=-2
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