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

[" 21.Show that the area of the triangle formed by the lines "ax^(2)+2hxy+by^(2)=0" and "],[qquad [" (x+my+n=0"," Is "^(2)sqrt(h^(2)-" ab ")],[" is "sqrt(am^(2)-2h|m+b|^(2))," square units."]]

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

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