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[" 9.In the figure,"],[" XY and "X'Y''" ...

[" 9.In the figure,"],[" XY and "X'Y''" are two "],[" parallel tangents to a "],[" circle with centre "0],[" and another tangent "],[" AB with point of "],[" contact Cintersecting "],[" XY at A and X'Y' at B."],[" Prove that "/_AOB=90^(@)" ."]

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