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The product of the perpendicular from an...

The product of the perpendicular from any poitn P(x,y) on the hyperbola `x^2/a^2 - y^2/b^2 = 1` to its asymptotes is

A

`(a^2b^2)/(a^2 + b^2)`

B

`sqrt(x^2+y^2)/(a^2 + b^2)`

C

`(zy)/(sqrt(x^2 + y^2))`

D

`(ab) /(a^2 + b^2)`

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The correct Answer is:
A
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