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Let P Q R be a right-angled isosceles t...

Let `P Q R` be a right-angled isosceles triangle, right angled at `P(2,1)dot` If the equation of the line `Q R` is `2x+y=3` , then the equation representing the pair of lines `P Q` and `P R` is (a) `3x^2-3y^2+8x y+20 x+10 y+25=0` (b) `3x^2-3y^2+8x y-20 x-10 y+25=0` (c) `3x^2-3y^2+8x y+10 x+15 y+20=0` (d) `3x^2-3y^2-8x y-15 y-20=0`

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