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Prove that orthocentre of triangle forme...

Prove that orthocentre of triangle formed by pair of lines `ax^(2)+2hxy+by^(2)=0` an the line `lx+my+n=0` is (kl, km) where `k=(-n(a+b))/(am^(2)-2hlm+bl^(2))`

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`k=(-n(a+b))/(am^(2)-2hlm+bl^(2))`
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