A pair of tangents is drawn to a unit circle with center at the origin and these tangents intersect at `A` enclosing an angle of `60^0` . The area enclosed by these tangents and the arc of the circle is (a) `2/(sqrt(3))-pi/6` (b) `sqrt(3)-pi/3` (c) `pi/3-(sqrt(3))/6` (d) `sqrt(3)(1-pi/6)`