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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