Find the slope of the tangent line to the curve (a lemniscate)
2(x2+y2)2=25(x2−y2)\displaystyle {2}{\left({x}^{{2}}+{y}^{{2}}\right)}^{{2}}={25}{\left({x}^{{2}}-{y}^{{2}}\right)}
at the point (−3,1)\displaystyle {\left(-{3},{1}\right)}

slope =  

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