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The angle between the tangents drawn from the point $(-1, 7)$ to the circle $x^2+y^2=25$  is

1. $\tan^{-1} (\frac{1}{2})$
2. $\tan^{-1} (\frac{2}{3})$
3. $\frac{\pi}{2}$
4. $\frac{\pi}{3}$

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I am getting $m = \frac{-4}{3}, \frac{3}{4}$