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  4. The angle between the tangents drawn from the origin to the circle (x-7)2+(y+1)2=25 is

Q. The angle between the tangents drawn from the origin to the circle is

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Solution:

Let and are the tangents drawn from the origin to the given circle (draw a figure).
Now, center and the radius .
Also .
If ' ' is the angle between the tangents then
.

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