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The range of value of 'a' such that angl...

The range of value of 'a' such that angle `theta` between the pair of tangent drawn from (a, 0) to the circle `x^2 + y^2 = 1` satisfies `pi/2 lt theta lt pi`, lies in

A

(1, 2)

B

`(1, sqrt2)`

C

`(-sqrt2, -1)`

D

(-2, -1)

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The correct Answer is:
B, C
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