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If the tangent and normal at a point on rectangular hyperbola cut-off intercept `a_(1), a_(2)` on x-axis and `b_(1), b_(2)` on the y-axis, then `a_(1)a_(2)+b_(1)b_(2)` is equal to :

A

3

B

1

C

2

D

none of these

Text Solution

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The correct Answer is:
D
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