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If the tangent and normal to xy=c^2 at a...

If the tangent and normal to `xy=c^2` at a given point on it cut off intercepts `a_1, a_2` on one axis and `b_1, b_2` on the other axis, then `a_1 a_2 + b_1 b_2 =` (A) `-1` (B) `1` (C) `0` (D) `a_1 a_2 b_1 b_2`

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