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If four points P, Q, R, S in the plane b...

If four points P, Q, R, S in the plane be taken and the square of the length of the tangents from P to the circle on QR as diameter be denoted by `{P,QR}` , show that `{P,RS}-{P,QS}+{Q,PR}-{Q,RS}=0`

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The correct Answer is:
Hence, `{P,RS}-{P,QS}+{Q,PR}-{Q,RS}=0`
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