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Let P be any Point On The Circle
OP Is The Radius Of The Circle
Line AB Is Perpendicular To P
Then OA > OP [Bcoz The Perpendicular Is The Shortest Distance From A Point Of The Circle]
Therefore Every Point Except P Is Outside The Circle O And The AB Is Tangent To The Circle
Therefore There Can Be Only One Tangent At a Point On The Circumference Of The Circle
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