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[" 2InatrangleABC,lines RO PRandQPareres...

[" 2InatrangleABC,lines RO PRandQParerespectively drawnparallelto linessce "],[" and AB passing through points "A" ,B and "C" ,as shown in fig."9.40" Shinser "],[BC=(1)/(2)times2R" ."],[qquad [R prod_(B)^(A):)^(Q)],[,P_(P)]]

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