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The range of values of a such that the a...

The range of values of `a` such that the angle `theta` betweeen the pair of tangents drawn from `(a,0)` to the circle `x^2+y^2=1` lies in `(pi/3,pi)` is

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`pi/3ltthetaltpi`
`pi/6lttheta/2ltpi/2`
`sinpi/6ltsinntheta/2ltsinpi/2`
`1/2<1/a<1`
`2>a>1`
`a in (1,2)`
`a in(-2,-1)uu(1,2)`
option 1 is correct.
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