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if the tangent from a pt P on the circle x^2 + y^2 = 1 is perpendicular to tangent frm P to the circle x^2 + y^2 = 3, then locus of P is a circle of radius a)2 b)3 c)4 d)none of these if the tangent from a pt P on the circle x^2 + y^2 = 1 is perpendicular to tangent frm P to the circle x^2 + y^2 = 3, then locus of P is a circle of radiusa)2 b)3 c)4 d)none of these
THe tangent to circle 1 : x.x1 + y.y1 = 1 from point(x1,y1)The tangent to circle 2 : x.x1 + y.y1 = 3 from point (x1,y1)These tangents are perpendicular. Hence,-x1/y1. -x1/y1 = -1x1^2 / y1^2 = -1x1^2 + y1^2 = 0Hence, NONE OF THESETHanksBharat BajajIIT Delhiaskiitians faculty
thanku sir
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