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[" Q.5Angle between the lines "(x)/(a)+(...

[" Q.5Angle between the lines "(x)/(a)+(y)/(b)=1" and "(x)/(a)-(y)/(b)=1" is "],[[" (a) "2tan^(-1)(b)/(-)," (b) "tan^(-1)(2ab)/(2)," (c) "tan^(-1)(a^(2)-b^(2))/(2),," (d) None of these "]]

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