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In Fig. 10.13, X Yand XprimeYprimeare tw...

In Fig. 10.13, `X Y`and `XprimeYprime`are two parallel tangents to a circle with centre O and another tangent AB with point of contact C intersecting `X Y`at A and `XprimeYprime`at B. Prove that `/_A O B\ =\ 90o`

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