In the figure XY and X'Y' are two parallel tangents to a circle with centre O and another tangent AB with point of contact C intersecting XY at A and X'Y'at B. Prove that angle AOB = 90 deg
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https://www.meritnation.com/ask-answer/question/rs-at-a-and-b-respectively-prove-that-angle-aob-90-deg/circles/3899107
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