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The equation of the tangents drawn from ...

The equation of the tangents drawn from the origin to the circle `x^(2)+y^(2)-2rx-2hy+h^(2)=0` are

A

`x=0`

B

y= 0

C

`( h^(2) -r^(2)) x - 2r hy =0`

D

`( h^(2) - r^(2)) x+ 2rhy= 0`

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