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The tangents drawn from the origin to th...

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

A

h=r

B

h=-r

C

`r^2+h^2=1`

D

`r^2=h^2`

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The correct Answer is:
A, B, D
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