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Add : p(p-q),q(q-r) and (r-p)...

Add : p(p-q),q(q-r) and (r-p)

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If the points (p, q) and (q, p) are equidistant from the point (x, y). show that x = y.

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Prove that cot^(-1)((pq+1)/(p-q))+cot^(-1)((qr+1)/(q-r)) +cot^(-1)((rp+1)/(r-p))=0 .