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[" 21.Show that the area of the triangle...

[" 21.Show that the area of the triangle formed by the line "ax^(2)+2hxy+by^(2)=0" and "1x+my+n=0" is "],[(n^(2)sqrt(h^(2)-ab))/(|am^(2)-2hlm+bl^(2)|)" sq.units."]

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