Prove that the curves \( y=x^{2}-3 x+1 \) and \( x(y+3)=4 \) intersect at right angles at the po...

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Prove that the curves \( y=x^{2}-3 x+1 \) and \( x(y+3)=4 \) intersect at right angles at the point \( (2,-1) \)
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