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The angle subtended by common tangents o...

The angle subtended by common tangents of two ellipses `4(x-4)^2+25 y^2=100a n d4(x+1)^2+y^2` at the origin is `pi/3` (b) `pi/4` (c) `pi/6` (d) `pi/2`

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The angle subtended by common tangents of two ellipses 4(x-4)^2+25 y^2=100a n d4(x+1)^2+y^2 =4 at the origin is pi/3 (b) pi/4 (c) pi/6 (d) pi/2

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