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prove that the product of the perpendicu...

prove that the product of the perpendiculars drawn from the point `(x_1, y_1)` to the pair of straight lines `ax^2+2hxy+by^2=0` is `|(ax_1^2+2hx_1y_1+by_1^2)/sqrt((a-b)^2+4h^2)|`

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