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If the tangent to the circle x^2+y^2=r^2...

If the tangent to the circle `x^2+y^2=r^2` at the point `(a,b)` meets the co-ordinate axes at the points A and B, and O is the origin, then the area of the triangle OAB is

A

`r^4/(2ab)`

B

`r^4/(ab)`

C

`r^2/(2ab)`

D

`r^2/(ab)`

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