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The angle between the pair of lines whose equation is `4x^2+10 x y+m y^2+5x+10 y=0` is (a) `tan^(-1)(3/8)` (b) `tan^(-1)(3/4)` (c) `tan^(-1){2(sqrt(25-4m))/(m+4)},m in R` (d) none of these

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