if the mean of y and 1/y is z the mean of y2 and 1/y2 is
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y+1/y=z
y2+1/y2=?
y+y=2y/1
2y+2+1/2
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if mean of y and 1/y is z then
the mean of y2 and 1/y2 is 2z2 -1
l hope it helps
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