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The sum of the slopes of the lines tange...

The sum of the slopes of the lines tangent to both the circles `x^2+y^2=1` and `(x-6)^2+y^2=4` is________

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The correct Answer is:
0
Since both the circles are symmetric about the y-axis, the sum of slopes of tangest is 0.
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CENGAGE ENGLISH-CIRCLE -NUMERICAL VALUE TYPE
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