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[" Let "PQR" be a right angled isosceles triangle,right angled at "P(2,1)" .If the equation of the line "QR" is "],[2x+y=3" ,then the equation representing the pair of lines "PQ" and "PR" is "],[[" (A) "3x^(2)-3y^(2)+8xy+20x+10y+25=0," (B) "3x^(2)-3y^(2)+8xy-20x-10y+25=0],[" (C) "3x^(2)-3y^(2)+8xy+10x+15y+20=0," (D) "3x^(2)-3y^(2)-8xy-10x-15y-20=0]]

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