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The equations of the tangents drawn from...

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

A

`x=0,y=0`

B

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

C

`y=0,x=4`

D

`h^2-r^2x+2rhy=0,x=0`

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