Equation of a tangent drawn from the origin to the circle \( x^{2}+y^{2}-2 r x-2 h y+h^{2}=0 \) ...
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0Equation of a tangent drawn from the origin to the circle \( x^{2}+y^{2}-2 r x-2 h y+h^{2}=0 \) is
(a) \( x=0 \)
(b) \( y=0 \)
(c) \( \left(h^{2}-r^{2}\right) x-2 r h y=0 \)
(d) \( \left(h^{2}-r^{2}\right) x+2 r h y=0 \)
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