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सिद्ध कीजिये कि वक्र `x^(2)+y^(2)+x+2y=0` तथा `xy+2x-y=0`, मूल बिन्दु पर एक-दूसरे को समकोण पर काटते हैं |

Answer» `x^(2)+y^(2)+x+2y=0`
`implies" "(dy)/(dx)=-((2x+1))/((2y+2))=-(1)/(2)," "(0,0)" पर "`
तथा `xy+2x-y=0`
`implies" "(dy)/(dx)=(-(y+2))/(x-1)=(-2)/(-1)," "(0,0)" पर "`
अब, `" "m_(1)m_(2)=-(1)/(2)xx2=-1`


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