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If the chords of contact of tangents fromtwo points `(x_1,y_1) and (x_2,y_2)` to the hyperbola `x^2/a^2-y^2/b^2=1` are at right angles, then `(x_1x_2)/(y_1y_2)` is equal to (a) `a^2/(-b^2)` (b) `b^2/(-a^2)` (c) `b^4/(-a^4)`

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