The angle between the pair of tangents from the point $(1, 1/2)$ to the circle $x^2 + y^2 + 4x + 2y -4=0$ is-
The angle between the pair of tangents from the point $(1, 1/2)$ to the circle $x^2 + y^2 + 4x + 2y -4=0$ is-
- A
$\cos^{-1}\,\frac{4}{5}$
- B
$\sin^{-1}\,\frac{4}{5}$
- C
$\sin^{-1}\,\frac{3}{5}$
- D
None of these
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- [IIT 1979]