Angle between Pair of Tangents

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Q. The angle between the tangents from $(\alpha ,\beta )$ to the circle $x^2+y^2=a^2$, is

1. $ta{n}^{-1}\frac{a}{\sqrt{{\alpha }^2+{\beta }^2-a^2}}$
2. $ta{n}^{-1}\frac{\sqrt{{\alpha }^2+{\beta }^2-a^2}}{a}$
3. $2ta{n}^{-1}\frac{a}{\sqrt{{\alpha }^2+{\beta }^2-a^2}}$
4. $Noneofthese$

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