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Show that the area of the triangle forme...

Show that the area of the triangle formed by the lines `ax^2 + 2hxy + by^2 = 0 and lm + my + n =0` is `(n^2 sqrt(h^2 - ab))/(|am^2 - 2hlm + bl^2|)`

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The correct Answer is:
`( n^2 sqrt( h^2 - ab) )/( | am^(2) - 2hlm + bl^2|)`
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