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{x+yx−y+x−yx+y=52x2+y2=90\large \begin{cases} \dfrac{x+y}{x-y} + \dfrac{x-y}{x+y} = \dfrac 52 \\ x^2+y^2 = 90 \\ \end{cases}⎩⎪⎨⎪⎧x−yx+y+x+yx−y=25x2+y2=90
Find the minimum value of y−xy-xy−x
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