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A parallelogram is formed by the lines a...

A parallelogram is formed by the lines `ax^2 + 2xy + by^2 = 0` and the lines through `(x_1, y_1)` parallel to them. Show that the area of parallelogram is `(|ax_1^2+2hx_1y_1+by_1^2|)/(2sqrt(h^2-ab))`

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