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By given,
 \frac{x+ \frac{1}{x} }{2}  =k
thus,x+ \frac{1}{x} =2k
x²+ \frac{1}{ x^{2} } =(x+ \frac{1}{x} )²-2
so,their mean is  4k²-2/2 
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next month
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pls teach me trigonometry
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