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Prove that the angle between the two tan...

Prove that the angle between the two tangents drawn from an external point are supplementary to the angle subtended by the line segment joining the centre.

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`In/_APO`
`/_A=90^0`
`/_A+/_AOP+/_APO=180^0`
`90+alpha+beta=180`
`alpha+beta=90^0`
`In/_BPO`
`/_B+/_OPB+/_BOP=180^0`
`90+beta+alpha=180`
...
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